Everything which is not forbidden is allowed. A very important principle, however it doesn't seem to really be the case anymore.
http://en.wikipedia.org/wiki/Everything_which_is_not_forbidd...
http://en.wikipedia.org/wiki/Everything_which_is_not_forbidd...
* Distribution of cocaine, methamphetamine and marijuana are explicitly forbidden by federal law, dating back at least to the mid-1900s.
* Conspiring to violate federal law has been explicitly illegal since 1867. [1]
The prosecution showed that Mr. Avaya knowingly participated in a conspiracy to violate laws related to drug trafficking. He wasn't prosecuted just for making "traps" in cars, but rather for knowingly making "traps" in cars for the specific purpose of transporting illegal drugs.