Maigret's holiday - 28

At what point in the day could the note have been slipped into his pocket, his left breast pocket?

It was an ordinary sheet of glazed squared paper, probably torn out of an exercise book.

The words were written in pencil, in a regular handwriting that looked to him like a woman's.

For pity's sake, ask to see the patient in room 15. When Inspector Maigret's wife falls ill on their seaside holiday, a visit to the hospital leads him on an unexpected quest to find justice for a young girl.