The best way to childproof Mary Jane edibles is not have them at all. But since the potheads “have to have them”, put them in a sealed tin, put an icky face on the tin and mark them with just the word of what is inside. Little kids are less likely to try and open them. However, big kids will not have a problem, and they will obtain them one way or another. Anyone caught driving while high should have their license taken for at least ten years.