I dont mean any disrespect to the man but i have serious doubts about his "practical aikido" i have owned and watched his videos, and was very unimpressed. As i stated above chin na would be more applicable to police work. As it would be easier to learn in a shorter amount of time, with a whole lot of more locks and such. Chin na encompasses alot of muscle grabs and pressure point manipulations as well which would be highly effective in police work.