How much THC would have to be in a persons blood system to be considered a DUI?

In Wisconsin, any measurable amount is illegal. The penalty is the same as if you alcohol is over .08

346.63(1)(am)

No person may drive or operate a motor vehicle while the person has a detectable amount of a restricted controlled substance in his or her blood.

It takes about a week to get the alcohol test back, and about 8-10 weeks to do a comprehensive drug check.

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This is an interesting question. I for one, think its stupid to give a DUI for marijuana in the system, since it shows up in the blood for so long, its impossible to use that to say somebody is driving under the influence. It's possible that the person smoked pot 2 weeks ago, and its still in their system, so they get a DUI, and that's ridiculous.

I'm lucky to live in a state that has a realistic view towards marijuana [CA], but I believe in decriminalization ultimately...that's a whole 'nother discussion though...

The amount is really going to vary by state. Here is a link to NORML.ORG, where they detail the DUI law for marijuana by state.

http://norml.org/index.cfm?Group_ID=6492

Well number one, taking blood to see the amount of alcohol in your system is okay because it will tell them an amount at that time. You could of smoked pot three days ago and had your blood taken on that fourth day and it still can say it is in your system. Number two, you can not get a DUI for THC in your system, and if your state is doing that, that is insane! If it was NOT found in the vehicle than nothing should of happened, you should of been able to drive away. GET A LAWYER.

Well a smell alone they cant do anything, but seeds, or smoke they can. They make suckers that taste like pot, and as long as you pass the test, you are good to go, and sometimes they may consider you by your pupil dialation.

i think they hold you for suspicion on DUI and then you take a urine test at the police station. if you refuse the urine test, then they do a blood test. police officers can put you in custody for any suspicion of anything especially when your driving.

any THC is a DUI, but if you pass the tests they wont take your blood.

they have to prove that u have smoked it that day which is not possible with a blood test..............just deny ever smoking it and tell them u were at a party 3 nights ago and u smelt some hash in the room (passive smoking )

any thc would be considered a dui. unlike alcohol,tch is completely illegal and post blood test you would be charged.

depends on the laws in that State/County...

I am not sure if there is a test for it or if it is the Police Officer's Desecration.