Hand-Wash and Pocket-Wash Evidence

The wash is the physical residue of a trap. Where the treated notes have been handled, the phenolphthalein transferred to the skin or the cloth reacts with a sodium carbonate solution and turns it pink, and the solution is bottled, sealed and sent for chemical examination. The resulting evidence is objective and, when properly collected, difficult to contradict. Its limits are equally definite: it establishes contact and nothing else, and the value of the prosecution depends on how the contact is explained.

1. What Is Washed, and Why

1. The hands. The fingers of each hand are dipped separately in a fresh solution, and the two solutions are kept in separate bottles. Separation matters because the accused may claim to have touched the notes only to push them away with one hand.
2. The pocket, the bag or the drawer. Where the prosecution case is that the notes were placed in a particular receptacle, that article is washed as well. A positive pocket wash answers the defence that the notes were thrust into the hand and dropped, because it shows that they were put away.
3. The table, the register or the file where the money is said to have been kept or slipped, in the same way.
4. A control sample. Good practice is to take a wash of the complainant's hands as well, and to conduct a demonstration wash before the trap so that the witnesses can depose to the significance of the reaction.

2. The Chain of Custody

• Fresh solution prepared at the spot, and the fact recorded, so that contamination of a pre-mixed solution cannot be suggested.
• Separate bottles for each wash, labelled with what was washed, corked and sealed with a seal that is then handed to a witness rather than retained by the investigating officer.
• A specimen of the seal taken and the seal impression compared when the bottles are opened.
• A memorandum in the post-trap panchnama recording each wash, the colour change and the sealing, signed by the witnesses.
• Prompt despatch to the laboratory with a forwarding memorandum, and evidence of the custody of the bottles in the interval.
• The chemical examiner's report, proving the presence of phenolphthalein and sodium carbonate, and the absence of any tampering with the seals.

3. The Recurring Defects

4. What the Evidence Can and Cannot Establish

A positive hand wash proves that the accused's hand came into contact with the treated notes. A positive pocket wash proves that the notes were in the pocket. Neither proves that a demand was made, that the receipt was voluntary, or that the money was connected with any official act. The inference from contact to guilt therefore has to be completed by the evidence of the shadow witness on the demand, by the pending work to which the demand related, and by the absence of a credible innocent explanation. The rule that emerges from the decisions, and was restated by the Constitution Bench in Neeraj Dutta v. State (NCT of Delhi), (2023) 4 SCC 731, is that mere recovery is insufficient, though it may form part of the circumstantial material from which demand and acceptance are inferred.

5. Testing the Evidence

• For the defence. Establish whether a demonstration wash was done; whether the hands were washed separately; whether the receptacle was washed; whether the seals were intact and the specimen seal produced; when the bottles were despatched and where they were kept; whether the shadow witness could hear; and whether an innocent explanation for the money was offered at the earliest opportunity, since an explanation first advanced at trial carries less weight.
• For the prosecution. Prove the procedure step by step through the panch witnesses rather than through the investigating officer alone; prove the pending file or application; lead the verification or recording of the earlier demand; and prove the conduct of the accused at the moment of the trap, which is often the most telling material.

6. Related Topics and Provisions