The records of the police and of the private agencies contain many instances where murderers have confessed their guilt long after the crime to supposed friends, who were in reality decoys placed there for that very purpose. It is a peculiarity of criminals that they cannot keep their secrets locked in their own breasts. The impulse to confession is universal, particularly in women. Egotism has some part in this, but the chief element is the desire for companionship. Criminals have a horror of dying under an alias. The dignity of identity appeals even to the tramp. This impulse leads oftentimes to the most unnecessary and suicidal disclosures. The murderer who has planned and executed a diabolical homicide and who has retired to obscurity and safety will very likely in course of time make a clean breast of it to some one whom he believes to be his friend. He wants to "get it off his chest," to talk it over, to discuss its fine points, to boast of how clever he was, to ask for unnecessary advice about his conduct in the future, to have at least one other person in the world who has seen his soul's nakedness.
The interesting feature of such confessions from a legal point of view is that, no matter how circumstantial they may be, they are not usually of themselves sufficient under our law to warrant a conviction. The admission or confession of a defendant needs legal corroboration. This corroboration is often very difficult to find, and frequently cannot be secured at all. This provision of the statutes is doubtless a wise one to prevent hysterical, suicidal, egotistical, and semi-insane persons from meeting death in the electric chair or on the gallows, but it often results in the guilty going unpunished. Personally, I have never known a criminal to confess a crime of which he was innocent. The nearest thing to it in my experience is when one criminal, jointly guilty with another and sure of conviction, has drawn lots with his pal, lost, confessed, and in the confession exculpated his companion.
In the police organization of almost every large city there are a few men who are genuinely gifted for the work of detection. Such an one was Guiseppe Petrosino, a great detective, and an honest, unselfish, and heroic man, who united indefatigable patience and industry with reasoning powers of a high order. The most thrilling evening of my life was when I listened before a crackling fire in my library to Joe's story of the Van Cortlandt Park murder, the night before I was going to prosecute the case. Sitting stiffly in an arm-chair, his ugly moon-face expressionless save for an occasional flash from his black eyes, Petrosino recounted slowly and accurately how, by means of a single slip of paper bearing the penciled name "Sabbatto Gizzi, P.O. Box 239, Lambertville, N.J.," he had run down the unknown murderer of an unknown Italian stabbed to death in the park's shrubbery.
Petrosino's physical characteristics were so pronounced that he was probably as widely, if not more widely, known than any other Italian in New York. He was short and heavy, with enormous shoulders and a bull neck, on which was placed a great round head like a summer squash. His face was pock-marked, and he talked with a deliberation that was due to his desire for accuracy, but which at times might have been suspected to arise from some other cause. He rarely smiled and went methodically about his business, which was to drive the Italian criminals out of the city and country. Of course, being a marked man in more senses than one, it was practically impossible to disguise himself, and, accordingly, he had to rely upon his own investigations and detective powers, supplemented by the efforts of the trained men in the Italian branch, many of whom are detectives of a high order of ability. If the life of Petrosino were to be written, it would be a book unique in the history of criminology and crime, for this man was probably the only great detective of the world to find his career in a foreign country amid criminals of his own race.
I have instanced Petrosino as an example of a police detective of a very unusual type, but I have known several other men on the New York Police Force of real genius in their own particular lines of work. One of these is an Irishman who makes a specialty of get-rich-quick men, oil and mining stock operators, wire-tappers and their kin, and who knows the antecedents and history of most of them better than any other man in the country. He is ready to take the part of either a "sucker" or a fellow crook, as the exigencies of the case may demand.
There are detectives—real ones—on the police force of all the great cities of the world to-day, most of them specialists, a few of them geniuses capable of undertaking the ferreting out of any sort of mystery, but the last are rare. The police detective usually lacks the training, education, and social experience to make him effective in dealing with the class of elite criminals who make high society their field. Yet, of course, it is this class of crooks who most excite our interest and who fill the pages of popular detective fiction.
The headquarters man has no time nor inclination to follow the sporting duchess and the fictitious earl who accompanies her in their picturesque wanderings around the world. He is busy inside the confines of his own country. Parents or children may disappear, but the mere seeking of oblivion on their part is no crime and does not concern him except by special dispensation on the part of his superiors. Divorced couples may steal their own children back and forth, royalties may inadvertently involve themselves with undesirables, governmental information exude from State portals in a peculiar manner, business secrets pass into the hands of rivals, racehorses develop strange and untimely diseases, husbands take long and mysterious trips from home—a thousand exciting and worrying things may happen to the astonishment, distress, or intense interest of nations, governments, political parties, or private individuals, which from their very nature are outside the purview of the regular police. Here, then, is the field of the secret agent or private detective, and here, forsooth, is where the detective of genuine deductive powers and the polished address of the so-called "man of the world" is required.
There are two classes of cases where a private detective must needs be used, if indeed any professional assistance is to be called in: first, where the person whose identity is sought to be discovered or whose activities are sought to be terminated is not a criminal or has committed no crime, and second, where, though a crime has been committed, the injured parties cannot afford to undertake a public prosecution.
For example, if you are receiving anonymous letters, the writer of which accuses you of all sorts of unpleasant things, you would, of course, much prefer to find out who it is and stop him quietly than to turn over the correspondence to the police and let the writer's attorneys publicly cross-examine you at his trial as to your past career. Even if a diamond necklace is stolen from a family living on Fifth Avenue, there is more than an even chance that the owner will prefer to conceal her loss rather than to have her picture in the morning paper. Yet she will wish to find the necklace if she can.
When the matter has no criminal side at all, the police cannot be availed of, although we sometimes read that the officers of the local precinct have spent many hours in trying to locate Mrs. So-and-So's lost Pomeranian, or in performing other functions of an essentially private nature—most generously. But if, for example, your daughter is made the recipient, almost daily, of anonymous gifts of jewelry which arrive by mail, express, or messenger, and you are anxious to discover the identity of her admirer and return them, you will probably wish to engage outside assistance.