John, a student, had a bad fight with his girlfriend, Gail was living with John in his apartment and had her own key. When John left for class, Gail immediately went to the police and reported that John was selling drugs in his apartment. She said she was John's girlfriend was living in the apartment with him. Without obtaining a warrant, the police went to the apartment and asked Gail to open the door and let them in. She did, and the police found heroin, which the seized. Was the seizure valid? State your reasons