A. If you provide services that could potentially result in:
you should have every customer sign a Waiver and Release Form BEFORE you provide the services.
This rule even applies to home owners who allow minors to use a pool, hot tub or spa on their property. If you can envision a situation where someone might sue you for damages, you should be getting a waiver and release signed first.
In certain circumstances, you will also want to have your customers indemnify you against any costs or damages you incur as a result of your dealings with them. For instance, a catering company would want a client to indemnify them against any legal actions brought against the company by guests attending the function who became ill due to reasons not caused by the caterer's negligence.