According to sources familiar with the inquiry, New York Attorney General Letitia James is looking into how several guardianship groups handle the financial and medical matters of elderly and infirm New Yorkers who are judged incapable of taking care of themselves.

The investigation, which is chaired by attorneys in the office’s charities section, comes after a year-long series that showed that some guardians took use of their positions for personal benefit, while others disregarded their vulnerable clients.