A former North Stonington man wanted for escape by U.S. Marshals for walking away from a halfway house in Hartford was caught by Westerly police Thursday.Lawrence Mark Sullivan, formerly of 23 Pine Crest Road, was charged with possession of clonazepam (251 mg. tablets). A felony screening date of Sept. 17 has been scheduled. He was held without bail on a federal detainer. U.S. Marshals contacted Westerly police Wednesday night to report they believed Sullivan had been at a house on Brandywine Drive in the days since his escape. He was located in the home and transported to The Westerly Hospital for X-rays, after police received information that Sullivan may have purchased a quantity of drugs, placed it inside of balloons, and swallowed it. Although no drugs were found initially, police were later called and advised that Sullivan may have had items concealed in his rectum. Police were advised that if the balloons burst, “it could potentially be fatal.”Sullivan was taken back to the hospital where, after being informed he was going to be given a laxative, he retrieved a cylindrical object wrapped in plastic and duct tape from his rectum containing tobacco and rolling papers. Another X-ray was ordered. Police said he then took the laxative, and after some time, more items passed.Sullivan was eventually transported to 4th Division District Court in Wakefield, where no pleas was entered as is customary in felony cases. He was turned over to U.S. Marshals.