Oh no they don't, nobody knows what they use. Since the police have shut their forensics laboratories the people who do the testing could use a 2 yard bit of kicker elastic and a well read copy of Playboy for all you know!
There are no defined procedures, no defined or approved test equipment and no approved or defined test pellets. There have been many threads on this problem. I use a Combro as it provides repeatable results due to the nature of the beast (ie sitting virtually on top of the muzzle).
Where did you read this. Ive noticed on a few sites youve not one thing decent to say are y