You are loaning the device and therefor have no culpability for what an individual may use it for.
you might consider adding that this device is not for the use of treating or curing any physical condition. All applications of frequency are experimental and unproven. This person has been advised to seek the counsel of a licensed medical practitioner.
You will tell the judge you advised them to see a dr but still rented them a unit?
There is not a day that goes by where I remember to thank God enough
"Remember, if you can beat the devil's wizard.....you get to."