That seems to contradict industry standard recommendations and practices! 
From this typical(?) manual
"Laser Safety
The Epilog Model 16000 Laser System is a Class 2 laser product, as defined in International
Standard IEC 60825-1.
The Epilog Model 16000 complies with 21 CFR 1040.10 and 1040.11, the Federal Performance Standards
for Light-Emitting Products, exceptfordeviationspursuantto LaserNotice No. 50, datedJuly16, 2001.
The Center for Devices and Radiological Health, of the US FDA, issued Laser Notice No. 50 to permit
manufacturers to classify and manufacture their products in accordance with the International
Standard.
The output of the embedded laser is fully contained. The laser cabinet has safety interlocks that
turn the laser off if any access door is opened during operation, and no special precautions are
necessary to operate the laser safely. Access doors are interlocked and can be opened without
the use of a tool. Any interlocked door that is opened while the machine is operating will
immediately stop the laser from firing."
Access panels are not interlocked and require a tool for opening or removal. Access panels should
always be installed when the laser is operating. Never operate the laser system with an access
panel removed."