This isn't a silver bullet, but it will probably help. Say you are driving high right now. A cop pulls you over and suspects you are high. Now, he's got to get

This isn't a silver bullet, but it will probably help. Say you are driving high right now. A cop pulls you over and suspects you are high. Now, he's got to get a blood test, which he needs to take you to a lab for and will probably need a warrant, because who is gonna consent to having their blood drawn. And most of the time, the blood test doesn't show anything useful, because unless it's done within a short time frame of you using cannabis, the THC will be broken down and it won't show that you smoked within the last few hours, only that you smoked recently, as in the last few days or weeks. So what kind of cop wants to deal with this? If you had an accurate test that could be done on the spot, it would be much easier for them. It's not like every cop will instantly be motivated, but I'm sure it'll help.