"and the DEA can check your records any time. they have caught at least some people (who were "diverting" cocaine up their nose) with this."
It would be trivial for any chemist to "divert" cocaine up their nose and not get caught if they put some thought into it. As you said, some already do "divert" cocaine up their nose, so obviously some chemists are interested in random guy's cocaine. If the DEA is catching people through record keeping, you can be sure there are some chemists who sensibly doctor the records at the same time.
If the chemist is interested in doctoring lab results to screw over a defendant (rather than get high).... well shit, we already know that is possible, don't we? That is the entire point of this discussion. There is really absolutely no sense in arguing that chemists cannot doctor evidence to send some guy up the river, we already know that they can.
"and the DEA can check your records any time. they have caught at least some people (who were "diverting" cocaine up their nose) with this."
It would be trivial for any chemist to "divert" cocaine up their nose and not get caught if they put some thought into it. As you said, some already do "divert" cocaine up their nose, so obviously some chemists are interested in random guy's cocaine. If the DEA is catching people through record keeping, you can be sure there are some chemists who sensibly doctor the records at the same time.
If the chemist is interested in doctoring lab results to screw over a defendant (rather than get high).... well shit, we already know that is possible, don't we? That is the entire point of this discussion. There is really absolutely no sense in arguing that chemists cannot doctor evidence to send some guy up the river, we already know that they can.