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CLEVELAND -- Is it possible to test positive for secondhand marijuana smoke in a drug test? Yes, however there must be extreme exposure, such as hours in an unventilated space with a lot of pot smokers.

But because the NFL's drug threshold is so low, there's a chance Josh Gordon may have a case for a couple of reasons.

RELATED: Gordon appeal set for Aug. 1

The World Anti-Doping Agency, whose standard is used on Olympians has a limit of 150. The U.S. Military threshold is 50 nanograms.

A nanogram is one billionth of a gram, which is essentially a grain of sand in a dump truck.

RELATED: Report: Gordon checked self into rehab

Gordon's legal team will argue Friday that his test results are flawed because the positive tests are so marginal that they show uncertainty whether they were actually positive.

Gordon's 'A' sample tested at 16 nanograms per milliliter, which is just one over the limit. His 'B' sample, which theoretically should be identical since it comes from the same specimen, tested at 13.63.

Follow WKYC's Senior Health Correspondent Monica Robins on Twitter: @MonicaRobins

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