This is a straw man because you preclude the condition that the babysitter may be an alcohol abuser too. That fact is I wouldn't want any drug abuser, alcohol abuser babysitting for me. Heck, I don't want one that abuses sunflower seeds baby sitting them either.
Marijuana should be legal. Heroin, meth, cocaine shouldn't be. The difference between marijuana and alcohol is << than the difference between marijuana and heroin, meth, cocaine.
You also probably don't know that there are many different types of Marijuana strains all bred for their distinctive highs. There are strains that one shouldn't even consider if you have a natural tendency to paranoia while others are more effective than 2 mg of lorazapam before bedtime. Others still will 'wake you up' to the reality we choose to forget and ignore while straight.
Ok, leave your kid with the pot smoker, since the lady having wine with dinner may be an alkie.
Legal? Really? So you want it to be over regulated and taxed like tobacco? You’ll be able to legally buy it but its consumption will be so regulated you’ll never be able to use it.