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The truth is, ecigs aren't used for anything illegal. Time and time again I see posts by people getting harrassed by officers saying ecigs are used for illegal activity, or can be. That is propaganda, and no one really uses ecigs for anything illegal. That isn't an opinion, that is just fact. There is NO reason to be harassed for having an ecig.
That's not exactly the truth...
"E-Cig" as meant to a vapor of nicotine fluids as and alternative to smoking do not contain anything illegal. However, other devices that happen to look just like e-cigs except on close inspection (IE opening them up) you find that instead of a vapor atomizer there is a combustion plate that combusts things like tobacco leaf and the other one. These devices, also have an atomizer that is a dead ringer for a an atomizer on an e-cig for hash oil. They are legal around the US because their main 'purpose' is combustion of dried tobaccos but law enforcement is well aware that other substances are the more likely use. There were available before the 'nicotine vaporizing' e-cig came along and guess what designs were only modified slightly or not at all for nicotine.
I know this as the devices are sold right next to the ego's in the local tobacco store (we are legal here now) and I hear all about it while the salespeople demonstrate them to possible buyers while I surf the new juice flavors and play with the newest 'toys' for hands on feel before I buy (online most cases cause its cheaper). But I have gotten a real education on these devices.
They are SO similar that I can be standing there with my PV in hand and even a long term user of 'the other type' mistakes me and the device for kindred souls. I was at the counter yesterday and the salesperson pulled out a new version for a customer and the battery with the atomizer looked exactly like my e-juice ego with a drip atomized. And actually made by the same company and it was the same battery and the atomizer was a dead ring even if I believe taken apart they will look different inside. People have various names for them and e-cig is one. In states where this recreation is not legal you may not be witnessing many really public demo's of these models and since you not aware of the other side of the coin give the Ranger a bit of slack for not knowing that there is a perfect legitimate and actually good reason for someone to have a battery with an atomizer on it.
Given that someone who vapes and has for a while cannot really tell the difference from the outside expecting a Law Enforcement official who only has been in-services in the device for fact that these devices can be used for inhaling illegal substances and therefore will probably tend to think that over 'opps that guy is using nicotine fluids'. And if other campers pointed him out to many these device are imagined to be the delivery device of many drugs aside from nicotine (most of which are not legal even in my state).
I had to go to court not more than a year ago to (before the other side was legal) to fight a drug charge for carrying my PV and nic juice and the arresting (and having the nerve to be puffing away sitting in my car next to a police officer at a red light). The officer's knew two things back then - my device was of the same (and probably buy) manufacturer as one used with illegal substances (even if the device was legal because it was made for legal substances - its shocking that someone would do something illegal with it and I am sure ever manufacturer and wholesaler and retailer is just as shocked as I am). The case came out fine once that bottle of what looked like oil with a possibly fake label on it that said it contained nicotine really was what it said it was (after the lab got through with it and determined it so anyway) and a lot of education of the judge, the whole things was dropped. The police were nice through the whole thing and I don't hold it against them - they do have a job to do and PV's don't light up and announce "Its just nicotine sir!" when we drive by. I tell you this not to brag about my almost criminal pass but so you know that I am neither Mr. Ranger's co-worker or a rabid supporter of anything law enforcement does.
And remember, even long before e-cigs were thought of many very innocent objects with very innocent original uses doubled as more 'insidious' tools. There are whole evidence lockers that look more like a kitchenware department then a lock up for drug paraphernalia. Heck, back in the day buying too many steel wool scrubber pads (without soap) would have the check out lady in the grocery store suspicious (okay I lived in the Height District in SF back then but still).
So, yes the Ranger did have enough cause to investigate. I know its easy to get dander up and immediately think "Vaper's Rights" and they are harassing him because they don't like e-cigs or think they are bad. Now that might have been true of the guy that pointed the Ranger in his direction - he might have known volumes about e-cigs but given the report of the conversation this Ranger, the last time he saw a device like this, was in a drug enforcement in-service.
And so, as much as no one likes to support law enforcement when they hear something like this you have to give them some slack for not being able to tell the difference across a campground or for having had an in-service that stressed that devices like these were healthier alternatives for tobaccos smokers - not something illegal drug enforcement concentrates on.
Obvious, if it was mentioned somewhere in their training or who he contacted - probably a supervisor - had has experience with this before and was able to tell the Ranger that since the fluid did not appear to be certain oils and that devices like these were used to vaporize nicotine which is a legal activity - some information is getting there. I am sure that he attitude was mainly because he did not get to spend the rest of the day in the air conditioned ranger's station sipping a soda while he wrote up the paperwork on a big drug bust. It must have been a horrible let down. You almost have to feel sorry for him - I bet that AC would feel nice about then.
This is why education that vaper's need to do is SO important. Law enforcement has to educate its people (sorry that this is the nature of the world) to look out for people breaking law's that we had part of getting on the books and that really are dangerous. I am sure that it is explained that they have a very legitimate use and what that is but that takes up about 2 minutes of the training as an explanation about why they cannot raid your local smoke shop for possession of drug paraphernalia. You could be in the same spot the OP was in any day given being in the right place at the wrong time with a cloud of vapor hanging around your head. And we need to be educated too. Saying that "ecigs aren't used for anything illegal" is lack of education too because the same device sold under a slightly different name can be if you happen to live where some substances are still illegal.
Mason jars to this day still are manufactured for people to use for canning. That's their primary purpose and if you don't know that they can be used for anything but that and you love canning your own food then of course you would assume that those lovely jars (did you know people have them as collectables these days - some of the very old ones with engravings?) could never be used for an illegal purposes and why did CS at Home Depot notify the police that 1 week ago you bought 100 of them because its pick your own green bean season and you going to can all you can pick. So happens in some states, because those jars are used for illegal substances (moonshine) they have to notify law enforcement of large purchases and it is enough to get you investigated. SOme women have learned that its better to hit 3 hardware store for 30 jars each then make a quick stop at one place for 100. And still if they happen to be 100 of them all nicely boxed in the back seat of the car and a police officer walks buy - he may be asking what they are for. And what police officer has no clue that people can foods? That's not even cause by lack of education - its just how this world is and when something has a dual purpose and one is illegal sometimes things get crossed up.