I know I've seen some of their officers using Serpa's. Not that the design would necessarily contribute to getting your booger hook on the bang switch during reholstering though.
http://m.wbtv.com/wbtv/db_330726/contentdetail.htm?contentguid=OCTd5POT
http://m.wbtv.com/wbtv/db_330726/contentdetail.htm?contentguid=OCTd5POT