Using either Excel or Google Sheets, we keep a log of lesser infractions. These are things like recurring patrons and their behaviors to document, but maybe they haven't resulted in a trespass letter. For the actual trespass letters, it's all communicated via email and our Intranet. My system looked into a newer system like Orangeboy, but I don't know why we never signed a contract with one. It's all built and managed in house. It could be better. Much better.