Felons in the Classroom

I wrote an entry about this issue a few weeks back, dealing with Grand Rapids and whether or not felons should be allowed to volunteer in the classroom.  Today's article (Click Here to Read Story) gave an update on the situation.  The board decided not to change the policy which prohibits anyone with a felony conviction to volunteer in the classroom.  What do you think about this?  Should someone who wrote bad checks (as the story shows) 20 years ago be prohibited from working in the classroom?  Should there be a line between some offenses, but not others?