Indiana authorities are searching for a Morgan County Jail inmate who escaped this week during general educational development testing at an off-site location.

Susan Lynn Robbins, 38, Indianapolis, sneaked away about 8 p.m. after excusing herself to use the restroom at Mooresville High School, said sheriff's officials.

"It seems like it was a planned deal, as smoothly as it went," said Maj. David Rogers, the jail commander.

Robbins was not handcuffed but was wearing an orange jail-issue shirt at the time. A deputy noticed her missing after three minutes, Rogers said. Robbins is scheduled for trial Monday in Morgan County on a forgery charge. She also faces a forgery charge in Hendricks County and an unknown charge in Owen County. With so many charges in different jurisdictions, she likely faces prison time, said Sheriff Robert Garner.

Robbins was participating in a program that gives inmates who did not graduate from high school a chance to earn a general education development certificate. Robbins and another inmate had taken classes at the jail then joined 14 other people in taking the required test.

The jail is in Martinsville, but the testing is done at Mooresville High School.

Officials say inmate security in such circumstances is done case by case.

"We had no reason to believe she was an escape risk," Garner said.

Many inmates choose the program as a good-faith gesture to reduce their time behind bars.

Officials said this is the first time an inmate abused such a privilege. In eight years, 65 inmates have gone through the program. Inmates are selected after meeting certain criteria, including whether they are violent felons or have a history of trying to flee.