how long does marijuana stay in blood
Report Abuse. Marijuana (thc) will be present in your blood for approximately 2 to 3 days after you have used it. It may be remain in your bloodstream past 2 to 3 weeks if you are a frequent and heavy user. Source(s): http://wiki4weed.com/how-long-does-weed-...Lynn Â· 1 year ago. Thumbs up.o all's i wanna know is, How long does THC from marijuana stay in your blood? i havent done it since feb. 6th and the blood drive is on the 19th.