This simple idea preceded by 15 years the requirements of the OSHA Lab Standard for "Standard Operating Procedures," "Control Measures," and "Special Provisions for Working with Particularly Hazardous Substances." Today it's not just a good idea, it's the law!
For too many years at academic institutions and some companies, health, safety, and the environment have been something extra. It's time that they become part of the process.
There are surely going to be times when experiments must continue running on their own while you do other things (go out to lunch or home to sleep). At these times, it’s important to consider all the things that could go wrong in your absence and to prepare for them.
Signing a rules agreement does several things. It makes you decide what the rules and policies are going to be. It shows everyone that you are concerned about health and safety. It keeps a permanent record of your safety standards.
Inspections get people involved in thinking about hazards and unsafe practices in the workplace. These should be done at least four times a year (monthly is better).