Adams's prediction was off by two days. From the outset, Americans celebrated independence on July 4, the date shown on the much-publicized Declaration of Independence, rather than on July 2, the date the resolution of independence was approved in a closed session of Congress.
LSD effects usually last for 12 hours. But LSD can stay in your system for up to 5 days after use. More on the bioavailability, half life and detection window
About 14-21 days. Marijuana is a fat soliuble drug which means that it stays in your fat cells. ChaCha on! [ Source: http://www.chacha.com/question/how-long-do-mouth-swabs-test-for-weed ]. More Answers to  How long do mouth swabs test for weed .