I had some... interesting... experiences similar to this BS during my 6th grade. The end results of this were in me being home schooled up until high school. And the crime? Get this: drawing medieval weaponry.

A lot of these early grade school admins really seem to have some strange problems with judgement. I heard a while back that a female elementary school student brought in a discharged shot gun shell - a
discharged shell... you know, empty/no danger what-so-ever? - and got expelled for it. For goodness sake, she probably found the silly thing on the side of the road and showed it to her teacher! What a load of horse sh*t...
To this matter I will cite the classic film, "Uncle Buck." I really have to applaud the character for telling the assistant priciple off for her charges against his niece. I'd link to YouTube, but there were no examples of the clip in high enough quality to warrant a posting here. However, you search yourself, look for something to due with "Uncle Buck" and "school."