http://web.princeton.edu/sites/ehs/labpage/laserpointersafety.htma seemingly fair overview of the common laser pointer
includes this:
Safety Considerations
Laser pointers are effective tools when used properly. The following considerations should be observed when using laser pointers:
Never look directly into the laser beam.
Never point a laser beam at a person.
Do not aim the laser at reflective surfaces.
Never view a laser pointer using an optical instrument, such as binocular or a microscope.
Do not allow children to use laser pointers unless under the supervision of an adult.
Use only laser pointers meeting the following criteria Labeled with FDA certification stating "DANGER: Laser Radiation" for Class 3R lasers or "CAUTION: Laser Radiation" for Class 2 pointers.
Classified as Class 2 or 3R according to the label. Do not use Class 3b or 4 products.
Operates at a wavelength between 630 nm and 680 nm.
Has a maximum output less than 5 mW, the lower the better