The state of marijuana research law defies common sense. Although residents of Washington state (and 14 others, including Maine) are free to purchase an astonishing array of cannabis products for recreational or medical use, many of the state’s finest researchers are handcuffed in their ability to examine the good – or harm – of those same products.

Federal law requires all research in federally funded laboratories to use only marijuana from a single facility – in Oxford, Mississippi. This absurd restriction needs to end.

A bill now before the U.S. Senate would improve matters dramatically and deserves approval. The bipartisan Medical Marijuana Research Act, which recently passed the House with resounding approval, would untie researchers’ hands nationwide.

Under the bill, qualified researchers in states that have legalized marijuana would be able to perform lab analysis of the cannabis available in those states.

The University of Washington’s laboratories could research the same products Washingtonians of legal age can already buy and consume. Privately funded labs can study the street-legal products, but the top-flight research institutions funded by the National Institutes of Health cannot collaborate.

“There’s currently these two (types of) entities where you can perform research, and there’s no bridge between the two,” said UW pharmacology professor Nephi Stella.

For Stella and other medical-marijuana researchers, this restriction hinders their ability to learn more about potentially transformative uses for cannabis products in medicine – such as the recent discovery that cannabidiol may be a useful treatment for epilepsy.

“Having one source of old-school cannabis product does not satisfy our needs for research,” he said.

Although the University of Mississippi’s marijuana-growing operation has worked to diversify its offerings in recent years, its selection is still limited to 11 marijuana varietals, mostly of lower potency than products widely available in Washington state.

Congress must end this federal choke point in drug research. Medical marijuana is now legal in 36 states, and 15 states allow recreational marijuana. Researchers in each one of them should be free to analyze the local products citizens can buy and consume for themselves. The goals aren’t limited to the medical world. States (including Maine) have not found a consensus definition for chemical thresholds for impaired driving after marijuana consumption. Washington voters set an arbitrary THC blood limit for drivers as part of Initiative 502 in 2012. California and Oregon do not have a set standard.

“We don’t have a good test for impairment because we can’t study it,” said U.S. Rep. Earl Blumenauer, D-Ore., one of the bill’s authors.

Science ought to inform this national conversation better. The Senate should pass HR 3797 to remove the barriers to cannabis research as marijuana legalization continues to proliferate across the country.

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