Thanks John ..... familiar with Halo, but not SAST. The Halo sounds great on paper, but it is a bit pricey I think and also only intended to cover a specific volume of airspace, since you can only expect to sense vapors so much as the volume of air increases. This results in a need for multiple Halo sensors to cover what could be an open area with significant dilution of the vapors ... hence the need for multiple Halo senors ... which brings me back to the pricey comment.
Did anyone see solutions specific to access control, locks, or access integration with video or other third party apps? How about anything related to wireless battery operated locksets?