I'm sure it is legal to use trebles in the river the article mentioned, but as I was saying, is it necessary? There must be a reason that some rivers(in some states/countries) only allow single hooks. Personally I think that single hooks allow an angler to release fish easier, reduces the chance of accidental snagging, and the fish stays on the lure better because it can't pry itself off by using one of the three trebles.

I have modified my plugs to single hooks, too.
Again, I'm just curious how many "single-hook" minded anglers are out there.