Leaving out of consideration those who are merely private policemen (often in uniform), and principally engaged in patrolling residential streets, preserving order at fairs, race-tracks, and political meetings, or in breaking strikes and preventing riots, the largest part of the work for which detectives are employed is not in the detection of crime and criminals, but in simply watching people, following them, and reporting as accurately as possible their movements. These functions are known in the vernacular as spotting, locating, and trailing. It requires patience, some powers of observation, and occasionally a little ingenuity. The real detective under such circumstances is the man to whom they hand in their reports. Yet much of the most dramatic and valuable work that is done involves no acuteness at all, but simply a willingness to act as a spy and to brave the dangers of being found out.
There is nothing more thrilling in the pages of modern history than the story of the man (James McPartland) who uncovered the conspiracies of the Molly McGuires. But the work of this man was that of a spy pure and simple.
Another highly specialized class of detectives is that engaged in police and banking work, who by experience (or even origin) have a wide and intimate acquaintance with criminals of various sorts, and by their familiarity with the latters' whereabouts, associates, work, and methods are able to recognize and run down the perpetrators of particular crimes.
Thus, for example, there are men in the detective bureau of New York City who know by name, and perhaps have a speaking acquaintance with, a large number of the pick-pockets and burglars of the East Side. They know their haunts and their ties of friendship or marriage. When any particular job is pulled off they have a pretty shrewd idea of who is responsible for it and lay their plans accordingly. If necessary, they run in the whole gang and put each of them through a course of interrogation, accusation, and browbeating until some one breaks down or makes a slip that involves him in a tangle. These men are special policemen whose knowledge makes them detectives by courtesy. But their work does not involve any particular superiority or quickness of intellect—the quality which we are wont to associate with the detection of crime.
Now, if the ordinary householder finds that his wife's necklace has mysteriously disappeared, his first impulse is to send for a detective of some sort or other. In general, he might just as well send for his mother-in-law. Of course, the police can and will watch the pawnshops for the missing baubles, but no crook who is not a fool is going to pawn a whole necklace on the Bowery the very next day after it has been "lifted." Or he can enlist a private detective who will question the servants and perhaps go through their trunks, if they will let him. Either sort will probably line up the inmates of the house for general scrutiny and try to bully them separately into a confession. This may save the master a disagreeable experience, but it is the simplest sort of police work and is done vicariously for the taxpayer, just as the public garbage man relieves you from the burden of taking out the ashes yourself, because he is paid for it, not on account of your own incapacity or his superiority.
The real detective is the one who, taking up the solution of a crime or other mystery, brings to bear upon it unusual powers of observation and deduction and an exceptional resourcefulness in acting upon his conclusions. Frankly, I have known very few such, although for some ten years I have made use of a large number of so-called detectives in both public and private matters. As I recall the long line of cases where these men have rendered service of great value, almost every one resolves itself into a successful piece of mere spying or trailing. Little ingenuity or powers of reason were required. Of course, there are a thousand tricks that an experienced man acquires as a matter of course, but which at first sight seem almost like inspiration. I shall not forget my delight when Jesse Blocher, who had been trailing Charles Foster Dodge through the South (when the latter was wanted as the chief witness against Abe Hummel on the charge of subornation of perjury of which he was finally convicted), told me how he instantly located his man, without disclosing his own identity, by unostentatiously leaving a note addressed to Dodge in a bright-red envelope upon the office counter of the Hotel St. Charles in New Orleans, where he knew his quarry to be staying. A few moments later the clerk saw it, picked it up, and, as a matter of course, thrust it promptly into box No. 420, thus involuntarily hanging, as it were, a red lantern on Dodge's door.
There is no more reason to look for superiority of intelligence or mental alertness among detectives of the ordinary class than there is to expect it from clerks, stationary engineers, plumbers, or firemen. While comparisons are invidious, I should be inclined to say that the ordinary chauffeur was probably a brighter man than the average detective. This is not to be taken in derogation of the latter, but as a compliment to the former. There are a great many detectives of ambiguous training. I remember in one case discovering that of the more important detectives employed by a well-known private Anti-Criminal Society in New York, one had been a street vender of frankfurters (otherwise yclept "hot dogs"), and another the keeper of a bird store, which last perhaps qualified him for the pursuit and capture of human game. There is a popular fiction that lawyers are shrewd and capable, similar to the prevailing one that detectives are astute and cunning. But, as the head of one of the biggest agencies in the country remarked to me the other day, when discussing the desirability of retaining local counsel in a distant city: "You know how hard it is to find a lawyer that isn't a dead one." I feel confident that he did not mean this in the sense that there was no good lawyer except a dead lawyer. What my detective friend probably had in mind was that it was difficult to find a lawyer who brought to bear on a new problem any originality of thought or action. It is even harder to find a detective who is not in this sense a dead one. I have the feeling, being a lawyer myself, that it is harder to find a live detective than a live lawyer. There are a few of both, however, if you know where to look for them. But it is easy to fall into the hands of the Philistines.
The fundamental reason why it is so hard to form any just opinion of detectives in general is that (except by their fruits) there is little opportunity to discriminate between the able and the incapable. Now, the more difficult and complicated his task the less likely is the sleuth (honest or otherwise) to succeed. The chances are a good deal more than even that he will never solve the mystery for which he is engaged. Thus at the end of three months you will have only his reports and his bill—which are poor comfort, to say the least. And yet he may have really worked eighteen hours a day in your service. But a dishonest detective has only to disappear (and take his ease for the same period) and send you his reports and his bill—and you will have only his word for how much work he has done and how much money he has spent. You are absolutely in his power—unless you hire another detective to watch HIM. Consequently there is no class in the world where the temptation to dishonesty is greater than among detectives. This, too, is, I fancy, the reason that the evidence of the police detective is received with so much suspicion by jurymen—they know that the only way for him to retain his position is by making a record and getting convictions, and hence they are always looking for jobs and frame-ups. If a police detective doesn't make arrests and send a man to jail every once in a while there is no conclusive way for his superiors to be sure he isn't loafing.
There are a very large number of persons who go into the detective business for the same reason that others enter the ministry—they can't make a living at anything else, Provided he has squint eyes and a dark complexion, almost anybody feels that he is qualified to unravel the tangled threads of crime. The first resource of the superannuated or discharged police detective is to start an agency. Of course, he may be first class in spite of these disqualifications, but the presumption in the first instance is that he is no longer alert or effective, and in the second that in one way or another he is not honest. Agencies recruited from deposed and other ex-policemen usually have all the faults of the police without any of their virtues. There are many small agencies which do reliable work, and there are a number of private detectives in all the big cities who work single-handed and achieve excellent results. However, if he expects to accomplish anything by hiring detectives, the layman or lawyer must first make sure of his agency or his man.
One other feature of the detective business should not be overlooked. In addition to charging for services not actually rendered and expenses not actually incurred, there is in many cases a strong temptation to betray the interests of the employer. A private detective may, and usually does, become possessed of information even more valuable to the person who is being watched than to the person to whom he owes his allegiance. Unreliable rascals constantly sell out to the other side and play both ends against the middle. In this they resemble some of the famous diplomatic agents of history. And police detectives employed to run down criminals and protect society have been known instead to act as stalls for bank burglars and (for a consideration) to assist them to dispose of their booty and protect them from arrest and capture. It has repeatedly happened that reliable private detectives have discovered that the police employed upon the same case have in reality been tipping off the criminals as to what was being done and coaching them as to their conduct. Of course the natural jealousy existing between official and unofficial agents of the law leads to many unfounded accusations of this character, but, on the other hand, the fact that much of the most effective police work is done by employing professional criminals to secure information and act as stool-pigeons often results in a definite understanding that the latter shall be themselves protected in the quiet enjoyment of their labors. The relations of the regular police to crime, however, and the general subject of police graft have little place in a chapter of this character.