Psychiatrymiddle twist
A 68-year-old woman is admitted after a fall at home. She says she takes 'a sleeping tablet now and then' and drinks 'a small sherry before bed'. Her speech is slurred, her gait is ataxic and she has bruises of several different ages. She lives alone, her only daughter lives interstate, her general practice is closed for the weekend, and she cannot name any of her tablets. She gives you permission to obtain information from any source you need. Which one of the following will most reliably establish what she has actually been taking?