One of the original methods of avoiding detection is to buy synthetic urine and substitute your urine with synthetic one. This works very well if you're not supervised. Another problem is that labs know what the temperature of a fresh urine sample should be

To ensure that you clear the drug test, you need to take certain measures in advance. You can use some Home Test Kits to ensure that you are toxin-free at the time of the test

Some people usually need to pass drug tests. There are different drug tests, such as blood test, urine test, saliva test, nail and hair tests