Here in FL, it is a no-no to be legally carrying a firearm and be altered in any way, including pot. As an aside, one is NOT required to notify a LEO if you have a concealed weapon unless they ASK you. The few times I've been pulled over (for speeding) in FL I have never been asked nor volunteered that info. And I'm talking about legal carry, BTW.
In the case of the video, it is certainly likely the cop came upon them and smelled pot very strongly, pungent "rapper weed" ("Lavish's" quote) if you will. Right away, any firearm will be made illegal by the fact the now deceased was in the presence of a controlled substance. The same scenario could unfold if the driver was pulled over for DUI alcohol. I didn't catch why they were pulled over in the first place and I'm sure it just wasn't DWB...
As for "Lavish", I doubt she will change her ways for the better, and no doubt milk her newfound celebrity for all it is worth. The gods will see through all the charade when the time comes...hopefully sooner than later.