Yes there are ways to tamper with them often addicts will get some elses uriine go into the bath room and
use the other urine
.I have heard of people putting suff in the urine
so it wont show drug
s. honeslty I would go with your gut and it you really want I drug test
i would look into blood or hair they are alot more accreate .I will say this too H is the hardest drug
there is to get and stay off of .Most people have to do long term rehab for
some more then once to get off H.