Police in Los Angeles say they are looking into allegations that pop star Britney Spears was drugged.
The star's father has been given control of her affairs
Police Captain Kyle Jackson said the claims were "being considered", although a formal investigation has not been launched.
No suspect has been identified as yet, he added.
Ms Spears' mother claimed in recent court papers that the pop star's former manager Sam Lutfi drugged her, cut her home phone and yelled at her.
The allegations led to a restraining order against Mr Lutfi, who was barred from coming within 250 yards (228 metres) of the singer.
Ms Spears has endured a very public meltdown since splitting from her husband, Kevin Federline, in 2006.
Her increasingly eccentric behaviour - which included shaving off her hair in full view of the paparazzi and a shambolic performance at the MTV awards - ended with a spell in a psychiatric ward at the beginning of February.
Her father, James Spears, has since been granted "temporary conservatorship" over his 26-year-old daughter's life and her estate, thought to be worth $100m (£50.8m).
Conservatorships are generally granted for people deemed to be unable to care for themselves or their affairs.
Over the weekend, Ms Spears was allowed to see her sons for the first time in nearly two months after reaching an agreement with her ex-husband.
"The process of reinstating the children's mother as a participant in their lives can commence," said Mr Federline's lawyer, Mark Vincent Kaplan.
Mr Federline's spokesman, Elliot Mintz, said Ms Spears' father had played a key part in making possible her visit to Jayden James, aged one, and Sean Preston, two.
He gave no further details of the reunion.