There was a lady on the flight who was either soppy drunk and/or under the heavy influence of drugs. Everyone around her was very uncomfortable & the only attention the airlines staff gave her was to ask her to exchange seats with another gentleman because she was sitting in one of the exit seats that requires you to help in case of an emergency. The lady jerked & coughed & when it was time to disembark, She couldn’t even get back to the lobby without assistance from another kind passenger. I am surprised that United doesn’t have some policy in place to keep someone in that condition from flying. I did speak to someone in the terminal about it before leaving the airport.