It's come to my attention that the old ways of disabling AirDrop file sharing:
defaults write com.apple.NetworkBrowser DisableAirDrop -bool YES
no longer works. This now returns:
defaults[17195:855346] Could not write domain /Library/Preferences/com.apple.NetworkBrowser; exiting
According to Wikipedia (yeah, I know...but still...): "Starting with OS X 10.10 Yosemite, the old version of AirDrop for Mac is replaced with the one for iOS."
Sooo...I need a new method for disabling this to meet security requirements. Any one else cross this bridge yet?