[tjfl]

IANAL, but curious and searched.

> A number of techniques designed to detect gunshot residues (GSR) on the hands of a suspect or victim have been developed. These techniques range from the now-discredited paraffin test to the more modern techniques which use instrumental analysis or scanning electron microscopy. The limitations of all GSR techniques are that the residues can be removed by rubbing or washing the hands and usually must be collected soon after the firearm is fired, yet even valid GSR tests are not conclusive.

https://www.ojp.gov/ncjrs/virtual-library/abstracts/forensic...

[giantg2]

Very few forensic techniques are conclusive for a case. They are usually conclusive as in the test was either positive or negative. Then the forensic expert has to give testimony as to what it means. Just look at the medical experts in the Chauvin trial. It's just like many news articles today - the facts don't lie, but people can misapply them to say different things.