How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Family Physician Your Own Question
Family Physician
Family Physician, Board Certified MRO
Category: Drug Testing
Satisfied Customers: 12816
Experience:  Medical Review Officer - Physician Trained and certified in drug test interpretation
Type Your Drug Testing Question Here...
Family Physician is online now
A new question is answered every 9 seconds

is there such thing such as contact high from marijuana.

Resolved Question:

is there such thing such as contact high from marijuana.
Submitted: 5 years ago.
Category: Drug Testing
Expert:  Family Physician replied 5 years ago.
Can you explain what you mean by a "contact high"?
Customer: replied 5 years ago.

if your in a room with a bunch of people who are smoking weed would you end up showing positive if you were drug tested.


Expert:  Family Physician replied 5 years ago.

There are several published studies that do demonstrate low level positive drug urine and blood drug tests after passive exposure to HIGH levels of marijuana smoke. This is one of those studies:

In this case, individuals who spent time in a small unventilated room in which 16 joints were smoked were found to have low levels of marijuana for short periods of time.


HOWEVER, this type of exposure is not really realistic to the claim that someone was accidentally exposed without their knowledge (since you would essentially have to be in a complete cloud of smoke). Multiple studies have been conducted with more realistic levels of exposure and they have NOT found positives with a more typical "passive" exposure above the threshold used in your test. This is the most recent of those studies.


Family Physician and other Drug Testing Specialists are ready to help you

Related Drug Testing Questions