Look for a Jujutsu, Judo, Hapkido, Aikido or a good Ninjutsu school in your area. There are a number of ways you can restrain and escort someone even without locking their limbs, these are generally considered safer. e.g. half and full nelson, various half-chokes and headlocks, and other come-along techniques. If you do not have proper training, the chances of injuring the person you are using this on (and thus lawsuit) are high. The chances of them escaping are also high.
(Website by Marc MacYoung, not me)