WENATCHEE — Chelan County narcotics detectives say a homeless man admitted to cooking methamphetamine in two makeshift outdoor labs after a trail of grocery receipts led to his arrest.

Donald L. Harrison, 54, was arraigned Wednesday in Chelan County Superior Court on three counts of manufacture of meth and one count of unlawful possession of pseudoephredrine.

The case began when the multi-agency Columbia River Drug Task Force investigated two small meth labs found in the Leavenworth area last year — one found April 17 on U.S. Forest Service land along Camas Creek Road near Highway 97, another discovered Aug. 19 near an Icicle Irrigation District gate on Duncan Road. Samples from both sites showed evidence of meth manufacture, detectives said.

At each site, a Safeway grocery receipt was found, both showing purchases with the same Washington Electronic Benefits Transfer card. A warrant search traced the card to Harrison, who was living in his car in Dryden when arrested Jan. 9.

Police say Harrison admitted responsibility for both labs and turned over two full packets and one half-full packet of pseudoephedrine tablets. He faces trial in March, with a maximum penalty of 10 years in prison on each charge if convicted.