IANAL, but I have worked on surveillance software. As far as I understand it would be virtually impossible for them to legally have a microphone running withou

IANAL, but I have worked on surveillance software. As far as I understand it would be virtually impossible for them to legally have a microphone running without you explicitly activating it. Signing the rental agreement is not explicit enough since other people could be traveling in the car and the definition of "consent" varies significantly between jurisdictions.