A spokeswoman for Nottinghamshire Police, said: "Police will be speaking to former residents and their families and will work closely with partner agencies to establish if any criminal offences have taken place."
"A police investigation has been launched after concerns were raised about the standard of care provided to residents at Autumn Grange."
Nearly 30 residents were moved out of a Nottingham care home today after "serious concerns" about the standard of care provided.
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She now has one pellet by her brain and one pellet by her heart.
They have been jailed for a total of 95 years.
She escaped with minor injuries because of the safety feature.