There is little point in collecting information from a confidential informant if the police can’t use it. How to use it in a way that is lawful and defendable is problematic for some agencies. The consequences of getting wrong are well documented and have resulted in deaths and lawsuits. This article discusses one such lawsuit and provides details of how to build a system to make sure everything is done lawfully and ethically. The article also addresses what needs to be done to ensure that informant information is used properly in obtaining warrants.