pot is great, but when it comes to your kids NEVER, I repeat, NEVER do anything that you think might jeopardize them. Just dating this guy may not be a problem, but if it gets serious there's a bigger problem. Only your friend knows the dynamics of what's at risk here so she is the one who must make a choice. If she believes that the custody issue with her child is sensitive right now and if dating this guy at all puts her kid at risk then, my god, that's a no brainer.