Even if Frum actually thinks the threat of legal action is an effective parenting tool on this issue, the currently marijuana legalization efforts won’t change that. I have yet to meet any serious reform activist pushing for legalization without any age limits. For example, both the new Colorado and Washington State laws set the age limit for marijuana use at 21. Marijuana would still be illegal for his kids. If Frum really thinks this tactic works, he can still tell his children not to use marijuana because doing so would be illegal for them.