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Very high levels of exposure can lead to unconsciousness or death, according to the CDC.

She told the police she had said "no" before lapsing into unconsciousness again.

According to the prosecutor's office, medical reports also suggested Payne may have fallen in a state of semi or total unconsciousness.

He “did not adopt a reflexive posture to protect himself and ... he may have fallen in a state of semi- or total unconsciousness,” officials said.

He “did not adopt a reflexive posture to protect himself and ... he may have fallen in a state of semi- or total unconsciousness,” officials said last month.