Ergonomic Study
Maui Innovative Peripherals commisioned Craig Conner, Human Factors Engineer, to compile information regarding the use of head pass drug test worn devices over long periods of time. An ergonomic study titled laptop batteries "Head-Controlled Computer Input Devices" is available [1]here.
The study was created in Adobe format, if you don't have Adobe Reader please click on the following link to download it for free from the Adobe website.