HANNIBAL, Mo. (AP) — Police are searching for a former Hannibal elementary school principal as part of a drug investigation. The Northeast Missouri Narcotics Task Force searched two homes last week in Hannibal and found enough heroin to make more than 800 capsules, with a street value between $8,000 and $12,000. Three people were charged, including former A.D. Stowell Elementary School principal Joshua Foust, who resigned as principal in early February. Also facing drug charges are 31-year-old Samuel Foust and 32-year-old Ryan Thompson, both of Hannibal.