Assertion: marijuana's level | /r/HasProperty | 1.0 – 6.4 ng/ml
Facets:
Source sentences:
text: In one study of chronic users, residual THC was detected for 24 to 48 hours or longer at levels of 0.5 – 3.2 ng/ml in whole blood (1.0 – 6.4 ng/ml in serum)