Well, most at home drug tests, the only one you really need to worry about is the Marijuana, because of the time it takes to leave your system naturally. Since i do not know what you are trying to pass, I will tell you about Marijuana
Bleach - Bleach is a very common way to pass a drug test. DO NOT DRINK IT! Put it in an eye drop bottle or something like that, and slip a little in when you have your back turned to your parents. It will dilute the THC and pass your test.
Tinting - If your parents don't even go into the restroom with you, just fill the cup 90% water and 10% urine. You'll pass.
Niacin/Detox Pills - Just take like 8 niacin or some detox pills and drink PLENTY of water. about 5-7 days depending on your weight and consumption of water.
That's about all I got. Good Luck
Source : Experience
Don't do drugs?
You shouldn't be doing drugs in the first place!
no you have to be drug free for a month to pass
Saliva and urine drug test -YES, but the best will be to home test yourself using One or 5 or 7 panel home drug test kit (from any CVS). Hair drug test- NO
The best way to pass a drug test is not to take the drug they are testing for.
Yes. Stop taking the hydro. THEN get tested.
Buy a detox shampoo and stop using the drug but the best remedy is don't do drugs clown
By not doing any drugs.
Don't use meth. Then you will always pass the drug test for it with flying colors. Simple.
Avoid illegal drugs
go to wallgreens get a home urine test
In all seriousness: Find out how long whatever it is stays in your system and quit using for that length of time before the test. It is the best method.
cranberry juice and alot of water.........