An Arvada man was sentenced to a year and a day in federal prison for trying to mail packages of marijuana.

Mark Herbert Koenig, 36, pleaded guilty to possession of a controlled substance with the intent to distribute.

According to court documents, Koenig was seen mailing packages four times -- three times in late 2015 and once in early 2016.

U.S. Postal Inspectors seized each package after a drug dog alerted to it. A warrant was obtained in each instance, and the packages were opened, each containing between 950 grams to 1.6 kilograms of marijuana. That's between 33 and 56 ounces.

On Jan. 13, 2016, a search warrant was obtained for Koenig's home, where postal inspectors found 123 mature marijuana plants.

“U.S. Postal Inspectors continue to aggressively target individuals who use the postal service to distribute controlled substances,” said Dana Carter, inspector in charge of the U.S. Postal Inspection Service, Denver Division. “Our efforts to protect the nation’s mail, and postal customers, from illegal drug shipments are highlighted in cases such as these, where repeat offenders are sent to federal prison.”