There are four levels of informant.
1. Average citizen
2. Fellow law enforcement officer
3. Mentally ill
4. Criminals or there associates
Informants are basically people how give officers important evidence regarding a case. Informants can have different motives for telling the police information and sometimes even going undercover. The main motives are
1. Money (these informants will do or say almost anything for the right price but depending on the info it might be outrageously expensive)
2. Guilt (these informants were involved one way or another and feel awful and want to kind of repent)
3. Fear ( ah fear that one emotion will either cause someone to go up with information