The job of a liaison police officer is to ensure communication between two entities. In this case, the job refers to an officer who ensures drugs aren't used illegaly. They could be used in schools to help intercept the flow of drugs to and from schools, especially students. They can also help educate students about drugs and help the community and the police cooperate in monitoring illegal activity. They can also help the community to use prevention strategies to eradicate drugs from the area. In addition, they can improve peoples' access to police in order to crack down on drug operations. In conclusion, police liaison programs can help keep a community drug free by helping the communication between the community and the police.