A study by the University of Colorado Boulder determined that the marijuana that's studied by federal scientists isn't as nearly as strong as what's available to consumers.

That's a problem, the study reported, because it is "potentially compromising the validity of research into the drug’s effects."

Last week, voters and more states joined Colorado in legalizing marijuana.

The pot that's studied by researchers comes the National Institute on Drug Abuse (NIDA), but that pot's not nearly as strong as U.S. consumers can purchase.

"The study found that NIDA strains average between 5 and 6 percent THC content while those in legal markets such as Seattle averaged close to 20 percent," according to the report.

Read more at the Denver Business Journal: http://bit.ly/2f0Hlja