Even if they delete some data it can still be recovered. I found files I've deleted with a secure delete program, then reinstalled the computer, info was STILL there, that's with free recovery software and being self taught. The forensic guys can find all sorts of stuff. For example, did you know your computer logs the serial number , device, model , access date, time, file name accessed of each device you plug in to the USB? They would have to use magnets to wipe the drives fully but that's like going full Hillary on them.
Do we know that machines haven't been wiped yet? Or altered by internal staff or poll workers?
Even if they delete some data it can still be recovered. I found files I've deleted with a secure delete program, then reinstalled the computer, info was STILL there, that's with free recovery software and being self taught. The forensic guys can find all sorts of stuff. For example, did you know your computer logs the serial number , device, model , access date, time, file name accessed of each device you plug in to the USB? They would have to use magnets to wipe the drives fully but that's like going full Hillary on them.
Just depends if they didn't replace the original hard drives.