HealthDay News — A long-delayed study to examine the use of marijuana in treating U.S. veterans with posttraumatic stress disorder will finally begin after the federal government removed a major roadblock.

The University of Arizona study was approved by the FDA, but the researchers could not get permission to buy marijuana from a National Institute on Drug Abuse research farm that is the only federally-sanctioned source of the drug, the Associated Press reported.

Last week, the U.S. Department of Health and Human Services said marijuana from the research farm could be purchased for the study.

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The decision was welcomed as a significant step forward by researchers who have long tried to get approval to investigate medical uses for marijuana, the AP reported.