I am not going to go on a big rant on this since I dont want to offend anyone. What is legal in my state might not be in yours so I am going just keep my political feelings out of it.
Police are not walking chemistry labs and without sending the liquid to a lab there is little way a police can tell what exactly is in your "delivery" device. Just because you are friends with a LEO and they have been exposed to your vaping does not mean that the guy they pull over that night does not have an ego filled with something not nic based. Hell just because you have exposed a local LEO it might be very simple to trick them into thinking that something illegal is an ecig.
My best advice know your rights people. The ACLU has a great docs that can be found here:
Know Your Rights When Encountering Law Enforcement | American Civil Liberties Union
No matter how you feel about the ACLU this is good info. Lord knows they have some stances I totally disagree with and cases I cant stand but that does not mean that the info on how to deal with LEO is bad.
basic rules are.
1. shut up stupid only give them your name
2. never consent to a search
3. If arrested tell them you want a lawyer
You might be able to talk your way out of getting arrested but I myself am going to exercise the rights I have. The sad thing is the truth will come out once the equipment goes to the lab but in the heat of the encounter keep your cool and be RESPECTFUL. Its not illegal to exercise your rights people so make sure you are informed. SO like GI Joe says "knowing is half the battle".
And yes just incase people want to know they do sell cigalike products to be used for medical use in CO that contain things that would be illegal in other places. So this topic is very valid and we ecig people need to understand that just because we are not doing illegal things does not mean the other person down the block is not using the exact same equipment to do something that is illegal at least in your area.