Yeah, we called the flat sap a slapjack too. Slapjacks/blackjacks were disallowed for duty carry sometime in the 1980's (supposedly un-P.C.), might injure some dirtbag (poor baby). Large flashlights, especially the old Kel-Lite were heavy and were quite often employed as an emergency self defense weapon as they were often already in the hand when it hit the fan. Here again, PC (not probable cause) and the introduction of video cameras as already mentioned, began to favor the poor underprivileged criminal. The PR-24 is a very effective impact weapon with proper training, but is somewhat unwieldy to carry on the belt and as a result is often found back in the patrol car when needed most. Another factor is training cost. Officers must re-certify annually with it. As a result many agencies, mine included, adopted the steel expandable baton (A.S.P. Tactical Baton). It also is very effective, compact in belt carrier so more likely to be at hand when needed. Another plus is that it only requires a one-time certification so saves funds for other training. I was A.S.P. instructor at my department and although not legally required we conducted a brief refresher during semi-annual training days to enhance proficiency.