Here is the "official" scoop from Yale University, Office of
Environmental Health and Safety.

http://www.yale.edu/oehs/jan96.htm#3

SAFE USE OF LASER POINTERS

Laser pointers have become inexpensive
as more and more vendors are
supplying these devices. These pen-like
laser pointers are generally Class 3a
lasers which operate at 670 +/- 10
nanometers. These small lasers produce
a very narrow, bright red beam that can
be used for presentations. Despite
their size and the fact that most are
powered by small, commonly available
batteries, potential hazards and
accidents have been identified by the laser
safety community. The power level may
be as high as 5 milliwatts continuous
wave. The main hazard is limited to
unprotected eyes of individuals who
look at the laser from within the
direct beam. No skin hazard exists. Safety
precautions should be followed.

Users should not stare directly into
the beam or direct the beam at the eyes
of another individual. Do not aim the
pointer into the audience. There is a
natural protective reaction to bright
light, called the aversion response, in
which one blinks and turns away. A
deliberate attempt to overcome this
response to view the beam from a laser
pointer is likely to produce an injury.

These devices can be hazardous if
mishandled . Buyers should be aware of
seller's claims of device safety. When
purchasing a laser pointer, consider
the purchase of a device with a
"caution" label - not a "danger" label. Laser
pointers with caution labels operate
with a lower power level than those with
a danger label.

Consider unscrewing the case to disable
the power source when storing it in
a shirt pocket or briefcase. If you
have any questions about laser safety, call
Radiation Safety at 737-2832.

Jerry Converse
Grand Coulee, WA