The Royal Canadian Mounted Police (RCMP), after learning that the Central Intelligence Agency considered Munsinger to be a "definite security risk", interrogated her in 1960 and conducted surveillance on her telephone conversations. However, they found no evidence that she had engaged in spying in Canada. She was briefly hospitalized in 1960 and was believed to have leukemia. Munsinger was arrested for trying to cash a bad cheque in 1961 but the charges were dropped; she left shortly thereafter to return to Germany.