Hi, Tim
Yes, I can see that there would be an issue if you have a different driver every day and you’re handing that person the Multi Mic to wear. Wouldn’t be very sanitary. Maybe just a coronavirus vector.
I did try the Multi Mic as a pointing device with my wife standing right next to a noisy stovetop kitchen fan and it worked pretty well. But I held it at a relatively extreme 45 degree angle standing right next to her compared to what you’d be able to achieve in the back sack of a car pointing at the driver and the driver would be facing away from you.
I don’t think that I have enough experience to advise you on this. @efigalaxie and/or @focusandearnit would be much more experienced with both the Multi Mic and the Roger Pen (which you can also buy on eBay, but you’d need an FM receiver, too).
Another suggestion, though, for the Multi-Mic would be some sort of box or holder that would allow you to put it on the dashboard of the car or the front passenger’s seat pointed at the driver. Then, as some point, you could carefully wipe down the container/holder and perhaps most of the Multi Mic yourself later. Perhaps when you’re done your ride, you just put the Multi Mic inside of a bag and “decontaminate” its holder/container and the Multi Mic later in a suitable situation for doing that?
Good Luck! We went to Costco yesterday to try to take advantage of the “Senior” hours (8 am to 9 am, Tuesdays and Thursdays). Our Costco had extended senior hours to 9:30 am. The line was extremely long, as deep as the building or longer and the coordinator standing outside the main entrance said that the entire line would never get into the building during the allotted hours and the separate line of “young” customers for the regular 10 am opening was already forming at 8:15 am - and the parking lot was already packed.