This just goes to show no matter how strong your passwords, up to date your OS patches etc your data is only ever as secure as the people who are accessing it. If your going to allow it to be put onto a USB stick it IS going to leave your premises. I used to work at a place that used to check people in and out with metal detectors to try and stop anyone taking out unauthorised items. The amount of stuff you could get out was astonishing as the security staff were low paid and had to deal with 100s of people in an out at the same time. They would just take your word that it was your belt buckle or loose change that set off the detector. This was in the says when 1GB USB memory stick was as big as you could get and now you can fit 400GB on a micro SD card which would be very easy to hide and you could liberate years worth of data at a time.