Also, the active ingredient only comes out after it's been heated ("decarboxylated"), so like in making edibles you'd have to heat it up first to get the good stuff out, then do the infusing. The same stuff binds most enthusiastically with fats, which don't go well into mead. However, I've run across various recipes for infusing it into vodka, so you should be able to get it into your mead - you may have more luck making a high alcohol infusion and using the port making technique to stop fermentation at the desired sweetness.
I don't know enough about the flavour of cannabis to say if it would go well with honey - at a guess, I'd expect it to taste vaguely like a dry-hopped metheglin? You probably want to infuse in secondary, since I'd guess the alcohol has a better chance to pick up the THC/CBD than water at the start.
It doesn't come up a lot here because of the legal issues, especially in the US where GotMead is hosted. If I understand correctly, talking about making a cannabimel/marajuanaglin/whatever we call it is basically still admitting to a Federal crime for Americans, even if it's legal in your state of residence, and for non-Americans it can be grounds for a lifetime ban for travel to the US. I myself haven't tried infusing it yet, but my country recently legalized for recreational use, it so I've been reading up just in case.