Crime Insider: Teacher went on Instagram to have kids send him naked photos By: Jon Burkett , WTVR CBS 6 Web Staff Posted at 8:27 AM, Dec 22, 2020 and last updated 2020-12-22 08:32:12-05 GOOCHLAND COUNTY, Va. -- A judge has revoked the $50,000 bond for a substitute teacher at Benedictine College Preparatory who was recently arrested on child porn charges. Rinku Costa, 32, was "was an occasional substitute teacher" from October through this month, according to a spokesperson for the Goochland-based school. Multiple Crime Insider sources told Jon Burkett that Costa was posing as a female on Instagram in order to get boys to send him nude photos.