A good article in the New York Times today, More With Dementia Wander From Home. I have known a few families who have been extremely proactive in dealing with wandering, placing door locks up high, making sure the person with dementia is registered with the Safe Return program, even placing alarms and cameras around the house.
More often, however, families never get around to doing anything. The burden of caregiving, especially for people with dementia, can be so great, it's impossible to think about more than the current crisis.
But we all need to be aware of this danger. When we have children, we spend a lot of time and effort baby-proofing our homes; now we have to worry about dementia-proofing our parents' homes.