in my inbox

I received the following e-mail this morning.  Does anyone know what this is about?  Or, for that matter, what an “explicative action” is?  Have laser pointers become so powerful now that an instructor casually swinging one around might blind or behead a student?

I’m the appointed Laser Safety Officer for the whole University.  Please distribute 
this notice to your peers, colleagues and students.

Due to the exponential growth in the availability of low-cost high-power hand-held 
laser pointers on the market (especially green laser pointers), an explicative 
action is urgent.

If you own and use a hand-held laser pointer for your lectures, presentations 
and demonstrations, please take a few seconds to review the label placed on it.

If the label states “Class 3b” (or alternative text like “Class 3B”, “Class 
IIIB”, “Class IIIb”), please note that your pointer falls under the provisions 
of the university’s Laser Safety Program and must be operated according to 
University Policy and State Regulations.  If you have this Class of pointers, 
you are urged to contact me ASAP.

You are encouraged to contact me even if there is no label or there is a 
different classification number.  In case of any doubts, please contact me.