Be alert at all times, and avoid BREAKING society's laws!!!
If you just had to puff that old devil weed and travel in your car, take shower for your own sake.
Even if you don't take a shower, obey all traffic alws, and you won't get pulled over.
But, puffing devil weed and inhaling can impair yoru driving abilities.
You can be arrested and charged for "driving under the influence of devil weed".
So, just as they say "don't drink alcoholic beverages and drive", "don't inhale devil weed, pop pills, shoot stuff and drive"!!!
If you OBEY their laws, their armed constabulary won't be able to do much to harm you.
Never argue with armed people with or without badges.
Never argue about your rights at 3:00AM in an urban or rural setting with a law enforcement officer, or do so at 3:00PM.
Moose has offered you great advice.
Here are a couple more takes on the matter:
https://www.youtube.com/watch?v=6wXkI4t7nuc
https://www.youtube.com/watch?v=bmtIizXdh88