The definitive marijuana guide from Cannabis UK
Hemp oil ingestion causes positive urine tests
for delta 9-tetrahydrocannabinol carboxylic acid
A hemp oil product (Hemp Liquid Gold) was purchased
from a specialty food store. Fifteen milliliters was consumed by seven adult
volunteers. Urine samples were taken from the subjects before ingestion
and at 8, 24, and 48 h after the dose was taken. All specimens were screened
by enzyme immunoassay with SYVA EMIT II THC 20, THC 50, and THC 100 kits.
The tetrahydrocannabinol carboxylic acid (THCA) concentration was determined
on all samples by gas chromatography-mass spectrometry (GC-MS) (5). A total
of 18 postingestion samples were submitted. Fourteen of the samples screened
above the 20-ng cutoff, seven were above the 50-ng cutoff, and two screened
greater than the 100-ng cutoff. All of the postingestion samples showed
the presence of THCA by GC-MS.
Costantino A, Schwartz RH, Kaplan P