LANCE,
As an LEO and martial artist, I think I can give you some advice. MARKF said it right, some form of grappling art is a necessity. Arts that are kick/punch are limited in application, though a grappling art that icludes atemi is ideal. A grappling art which also makes allowances for the fact that the opponent (suspect) may have a weapon is even better.
I remember reading in HE Davey's Aiki jujutsu book that one of the Takeda's said that police will be using "jujutsu" when arresting suspects, based on the dynamic involved in seizing and arresting a subject. They seemed to specifically say that this is not "Aiki."
Though my training is in submission grappling and koryu torite, from what I have experienced on the street I think that Aikijujutsu, as has been previously described in this forum, would be a good art for law enforcement. It contains subtle aspects (more Aiki oriented) which may come in handy for less resistive suspects, and jujutsu methods which may come into play with seriously motivated and aggressive suspects. It seems that it may be adapatable to varying levels of force (as most jujutsu should be.)
I don't know how much Aikijujutsu focusses on groundwork, but as an LEO your primary goal in non-lethal uses of force will be to get the bad guy off his feet and controlled on the ground. I personally see a subejct on his stomach on the ground and you pinning with a knee to the small of his back as "groundfighting," some do not. Still, you will nees relaible methods for controlling someone on his stomach on the ground, on his back on the ground, on his knees on the ground, etc.
Hope this helps to point you in the right direction.
KIT LEBLANC
Feel free to E mail me at kitleblanc@aol.com if you have further questions.