No- Simple at home tests that require little or no chemistry experience such as Reagent Testing are presumptive, you must first know exactly what substance (or close structural isomers) you suspect will be in the sample, then find an applicable reagent.
Yes- Mass Spectrometry (MS) sample testing, but even ion gas-phase/plasma based analytical chemistry has difficulty isolating compounds of near and exact molar mass. A prime example are the alkylbenzene derivatives, one of them specifically; N-isopropylbenzylamine is virtually indistinguishable from meth on the standard test graph. A secondary mass spectrogram generated using specific meth/N-iso analytical conditions are required (see image).
Expect to pay around $600 per sample, I can send you a USA link with a coupon code for $50 off if you’re serious, but soon as you start asking for the kind of liquid chromatography mass spectrometry conditions only ordered by LE there’s gonna be some red flags.
Maybe sterilizing tinctures
Or metal salts heated under vacuim for a few hours
Maybe things sublime?
I dont know, not a meth cook
Fester cant answer
He is in jail
Last i heard his final tweaker project
Was putting a new polish on his wooden floors