although, a different user on this site (forgot who, not trying to steal ur spotlight or anything) said u can just use home drug tests lol, just mix the sample with water and put it in the designated cup (or put the strip/stick/whatever in, depending on ur test. just do it like u would if u pissed in it) and it should tell u what drugs ur sample contains (out of the drugs it tests for ofc). only problem is it wont rlly tell u about adulterants, its just able to detect the presence of the drug u want (or maybe other drugs on the screening, such as testing a pressed adderall this way and then having it screen positive for opioids). that method has its potential uses (although ive never personally done it), but i dont think its super effective. still worth a shot if u cant afford a testing kit, i may try it sometime, idk lol ^^;
that post is also the first and last time i heard about this, so if someone else tested this method lmk if it works. if its not totally useless then its at least worth considering imo