Their report said there were numerous "ligature points" in cells, where detainees could harm themselves.
BBC: Inspectors condemn West Midlands force's cells
He was found hanging from a ligature in his single cell by staff at 0550 BST.
BBC: Prisoner found hanged in cell
Injuries to the front of her neck suggested a "soft ligature" had been used.
BBC: Rachel Manning 'strangled and hit 10 times'
The force said it "has already addressed many of the areas concerned around ligature points in cells".
The 17-year-old had been dragged into bushes, sexually assaulted, had had her throat cut and had a ligature round her neck.
BBC: NEWS | UK | Scotland | Edinburgh, East and Fife | A life of abuse, rape and murder
"Virtually every cell surveyed across the estate failed to pass our safety examination - there were numerous ligature points and health and safety monitoring was inconsistent, " the report said.
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