Police do have road side test got thc. They do mouth swap witch I believe I'd accurate within 20 min
I do not agree though with the gateway drug theory. I believe it's more on who you are and who you associate with. I'm a pot smoker and have never tried or had any want to do another narcotic.
I have had friend who got into serious narcotics and I can tell you they were off my friend list instantly.
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