In response to the incident, HISD issued a statement saying, "Beginning Thursday, HISD will ask all contractors with employees working in our schools to submit written verification that they are following all policies we have in place to protect students."
For 35 years, Sidney Green has been in and out of the Texas prison system. His identity was captured for the camera again and again. The first time was in 1976 he when was convicted of raping a child.
He was convicted of sex assault of child in 1976 and 1980, assault in 2010, and now in 2011 he's charged with aggravated sexual assault of an adult.
Houston police say officers from the North Division Warrant Team arrested Green on Wednesday at Black Middle School where he was working for an electrical contractor at the building.
Investigators say the 53-year-old approached a woman at the intersection of Blue Ash Drive and Barren Spring in August. The victim told police that Green demanded she get in his truck at a gas station then he drove her to a dead end street off Greens Road and raped her.
Police say they recovered evidence from that scene.
The victim told investigators the man was holding what she believed was hand grips to a handgun in the front pocket of his pants and she feared for her life.
Days later, the victim told investigators the man who raped her was sitting on a motorcycle at the same gas station as the night of the rape. A license plate number led investigators to an arrest.
HISD's statement also said, "All HISD contractors are contractually obligated to perform criminal background checks on their employees working in schools. The safety of our children is HISD's top priority and we are deeply disturbed to hear that this policy appears not to have been followed in this case."