I believe that many Police departments and other law enforcement agencies should have been briefed on electronic cigarettes by now. Still, you could get shot for reaching for anything under some circumstances. Some people try to commit suicide this way.
Trust me, three months ago I had never heard of an e-cig. I found them on the Internet. I haven't found one single person that I work with that use them; 99% never heard of them.
I certainly can't speak for local PDs but I don't see anyone taking time during roll call to talk about e-cigs. That is unless the particular town came out with an ordinance preventing their use. Even in the remote chance that e-cigs came up between a group of coppers, they are still far less likely to know about the different types of mods. Unless one of them is a vapor. This forum's sub group "thin blue line' illustrates the low percentage of public safety officers vaping. We're not exactly the largest sub group.