I placed a bag of marijuana in my daughter's lunchbox
Why would you put marijuana in your child's lunch box?
I had to put it somewhere.
It is irresponsible and dangerous to give your child weed or any drug. Doing this can cause your child to be removed from your home by a social worker when it is discovered in your child's lunch box.
Well, maybe it was wrong, but it's too late now.
If your daughter accidentally ingested it, that would be very dangerous. Also, if an official at the school sees it, both you and she could be in a lot of trouble. You should protect your kids, not put them in danger.