A recent fishing trip to Canada went south when at the border coming back into the US a legal search of the vehicle turned up small marijuana joint (1/3 left) brass plumbing parts (used as a pipe at one point) and a sheet of paper with marijuana pipe residue on it.
The first two charges make sense to me paraphernalia and small amount marijuana possession. However, the residue (wiped on a full sheet paper weighed 5.2g) is being considered hashish and is being charged as a 5th degree possession, as hash is not considered to be under the small amount marijuana charge.
Is there a legal classification for marijuana waste/pipe residue in MN? Is this charge correct?