See which robots Google uses to crawl the web. Crawler is a generic term for any program (such as a robot or spider) used to automatically discover and scan websites by following links from one webpage to another. Google's main crawler is called Googlebot.
Eleven years ago, the Queens Library system, the largest in the nation by circulation, hired a professional enforcer to collect the 25-cents-a-day late fines as well as missing library materials from books to DVDs to rare musical scores.
Make sure to check your state-specific laws. In most areas, you can charge a single late fee, a per-day late fee and even a per-week late fee. Your local laws will dictate how much these fees can be, so don't try to take advantage of the system and overcharge tenants. This could end badly.