I always use a meter and then go back with a voltstick .
I have found failed disconnects and secondary feeds that would not have been fun to find by touch.
I ALWAYS cut the handles off failed disconnects and mark a warning with paint markers ....so the next guy won't DIE! ... I mark units as to and if the have secondary feeds. I always try to get a customer to repair a disco that's failed but still remove the handle as they may say sure and blow it off or forget....
I could not live with myself knowing I left something that injured or killed some one!!!!!!