Thank you for your response, you have verified the thoughts I was having on the subject.
I will use the 5 V TTL To control the laser by turning it off and on and the button on the back of the unit to go to low power when needed.
I am using a breakout board that controls the steppers and other functions of my Home designed and built cnc router.
The plan is to use the laser as another tool while I complete the projects that I am already doing with only cutting tools. Wood-burning by way of the laser will add an entirely new dimension to the work I am doing.
In my opinion less worry about liability and more concern for Goodwill and customer satisfaction would stand them in much better position.
Thanks again for your assistance!