[ARCHIVE ANSWER]

In Texas, it is illegal to sell any product for the purpose of defeating a drug test.
However, companies still sell products to help you.
Teas, Sure-Jell, herbal products, and “detox drinks” are cheap, but even cheaper still are
ingesting water, creatine powder, and B vitamins. The “money-back guarantee” on detox
drinks is generally marketing scam. Even if a company makes good on the guarantee
you're still screwed.
Another product line includes synthetic urine and devices that inject it into collection
vessels. One device uses a chip set connected to a heating element that maintains the
sample at body temp. Some come with a simple tube; others have a latex penis. This is by
far the more expensive route.