False. The most common route of infection is still using IV drugs.
Yes a long time for a drug to stay in your system for sure, but it does happen with that type of drug. I don't know the reason why but here's a link you can look at.
http://www.passyourdrugtest.com/timetable.htm
standard disclaimer:
My answer in no way is intended to promote the use of drugs of anykind.
fret