The senator, Joel Guerriau, 66, a centrist for the Loire-Atlantique region of western France, denies the charges.
Ms. Josso told investigators that she had left Mr. Guerriau's home shortly after feeling ill after drinking a glass of Champagne there, and she has not accused him of sexually assaulting or raping her.
Laure Beccuau, the Paris prosecutor, told RTL radio on Friday that investigators suspected that the drug used by Mr. Guerriau was ecstasy.
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