But however laudable may be the end proposed by the commons, I cannot, my lords, be so far dazzled by the prospect of obtaining it, as not to examine the means to which we are invited to concur, and inquire with that attention which the honour of sitting in this house has made my duty, whether they are such as have been practised by our ancestors, such as are prescribed by the law, or warranted by prudence.
The caution, my lords, with which our ancestors have always proceeded in inquiries by which life or death, property or reputation, was endangered; the certainty, or at least the high degree of probability, which they required in evidence, to make it a sufficient ground of conviction, is universally known; nor is it necessary to show their opinion by particular examples, because, being no less solicitous for the welfare of their posterity than for their own, they were careful to record their sentiments in laws and statutes, and to prescribe, with the strongest sanctions, to succeeding governments, what they had discovered by their own reflections, or been taught by their predecessors.
They considered, my lords, not only how great was the hardship of being unjustly condemned, but likewise how much a man might suffer by being falsely accused; how much he might be harassed by a prosecution, and how sensibly he might feel the disgrace of a trial. They knew that to be charged with guilt implied some degree of reproach, and that it gave room, at least, for an inference that the known conduct of the person accused was such as made it probable that he was still more wicked than he appeared; they knew that the credulity of some might admit the charge upon evidence that was rejected by the court, and that difference of party, or private quarrels, might provoke others to propagate reports once published, even when in their own opinion they were sufficiently confuted; and that, therefore, an innocent man might languish in infamy by a groundless charge, though he should escape any legal penalty.
It has, therefore, my lords, been immemorially established in this nation, that no man can be apprehended, or called into question for any crime till there shall be proof.
First, that there is a corpus delicti, a crime really and visibly committed; thus before a process can be issued out for inquiring after a murderer, it must be apparent that a murder has been perpetrated, the dead body must be exposed to a jury, and it must appear to them that he died by violence. It is not sufficient that a man is lost, and that it is probable that he is murdered, because no other reason of his absence can be assigned; he must be found with the marks of force upon him, or some circumstances that may make it credible, that he did not perish by accident, or his own hand.
It is required, secondly, my lords, that he who apprehends any person as guilty of the fact thus apparently committed, must suspect him to be the criminal; for he is not to take an opportunity, afforded him by the commission of an illegal act, to gratify any secret malice, or wanton curiosity; or to drag to a solemn examination, those against whom he cannot support an accusation.
And, my lords, that suspicion may not ravage the reputation of Britons without control; that men may not give way to the mere suggestions of malevolence, and load the characters of those with atrocious wickedness, whom, perhaps, they have no real reason to believe more depraved than the bulk of mankind, and whose failings may have been exaggerated in their eyes by contrariety of opinion, or accidental competition, it is required in the third place, my lords, that whoever apprehends or molests another on suspicion of a crime, shall be able to give the reasons of his suspicion, and to prove them by competent evidence.
These, my lords, are three essentials which the wisdom of our ancestors has made indispensable previous to the arrest or imprisonment of the meanest Briton; it must appear, that there is a crime committed, that the person to be seized is suspected of having committed it, and that the suspicion is founded upon probability. Requisites so reasonable in their own nature, so necessary to the protection of every man's quiet and reputation, and, by consequence, so useful to the security and happiness of society, that, I suppose, they will need no support or vindication. Every man is interested in the continuance of this method of proceeding, because no man is secure from suffering by the interruption or abolition of it.
Such, my lords, is the care and caution which the law directs in the first part of any criminal process, the detainment of the person supposed guilty; nor is the method of trial prescribed with less regard to the security of innocence.
It is an established maxim, that no man can be obliged to accuse himself, or to answer any questions which may have any tendency to discover what the nature of his defence requires to be concealed. His guilt must appear either by a voluntary and unconstrained confession, which the terrours of conscience have sometimes extorted, and the notoriety of the crime has at other times produced, or by the deposition of such witnesses as the jury shall think worthy of belief.