They cannot know for sure, but it is an indicator. When smoking marijuana, the tongue sometimes becomes dry or white. In slang it is known as "having cotton mouth." There are also oral swabs that many officers carry. The swab tests for marijuana. The officer can swab the tongue and get a result right there on scene.
No
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marijuana* and not immediately
the color of your tongue generally doesnt change. but the cotton mouth associated with marijuana will give it a dried out appearance sometimes with a thick coat of white saliva.
you can. you can also lick a car, but it won't make it drive...
Wet with tongue not side of mouth
no it is in the nasal cavity when looking for prey
They are looking for heat signatures from a animal. The tongue tells them what is around them.
I have a lot of large swollen taste buds on the very back of my tongue and am wondering the same.
A tongue depressor.
Well that needs to be determined by an experienced professional body piercer, who is looking at the tongue to determine the correct location for the piercing.
It's a certain tongue ring with two jackhammer Looking designs on the side it's Preety bad azz