Traffic control, doctors, relatives and neighbors know Mom's vascular dementia is bad enough that she shouldn't be driving. She failed to show up for a test at the department of motor vehicles and they revoked her license. We wrote to the DMV because her regular doctor said he didn't see a decline. She has show timers and looks real good sometimes. We took the car keys and she called the Sheriff at 1 AM to get them back from my sister, who did not give them back. Somehow Mom got another key and is driving when we are not there. We are concerned for her and other drivers. Any suggestions would help.