I've gotta disagree with this point.
Most (if not all) LE agencies teach a "defensive-tactics" program that includes the restraint/control/escort techniques (for example: PPCT, CLAMP, etc.). What many LE agencies DO NOT teach (or don't teach enough) is how to fight. That is, how to deal with someone that is not happy that they're being arrested and/or are actively trying to injure or kill the officer. In a situation like that, those nice little restraint techniques (that are designed not to hurt the bad guy so the department won't get sued) are not going to be very useful...at that point, it's time for some brutal fighting skills.
My point is that LEO's typically are provided with their "arrest" training, if they're going to seek training on their own, I tend to recommend something a little more "survival oriented."
just my $0.02