It's because our bodies do not recognize cannabis as a foreign substance. That's why it stays in our system for so long. All other drugs are quickly filtered out.
The percentiles are not a factual representation of the number of accidents caused by driving while stoned.
Reefer Madness is NOT a factual documentary!
Actually it’s because THC bonds to fat molecules, and are released over time. Nothing to do with what our bodies “recognize”. Other than that you are correct.