The issue focused on an investigation by the federal Department of Justice's Office of Professional Responsibility that found there was "insufficient evidence" to file criminal charges against members of a medical marijuana research team.

In 2015, researchers at Washington State University were charged with scientific misconduct for allegedly failing to account for study results in published studies. The scientists said they could not remember how many experiments they had completed and did not want to keep data from them.

But those researchers have since come under fire for having held science