my son got bisted for less than a gram of marinuana on school property (in his car) he is 17. what can we expect?

It would be a good idea to retain an attorney.  First, he doesn't want a drug related conviction on his record, there is currently no way to expunge (remove) such an offense.  Secondly, a plea of guilty or finding of guilt have can have collateral consequences to his driver license under Missouri's Abuse and Lose Law.  That would require a 90 day loss of driving privileges as well as having to take a $485 SATOP class to get his driving privileges back.  Finally, if the charges are in State Court, he could be found ineligible for federal financial aid. Thank you, This answer does not create an attorney/client relationship.