Inmates for years have thought of ingenious -- and sometimes very compromising ways -- to sneak contraband inside prison walls. They've bribed guards, used carrier pigeons, had relatives put the goods in body cavities and, of course, who can forget a classic routine: baking a file into a cake. But modern technology is quickly making life easier for inmates -- and less uncomfortable for family and friends -- looking to smuggle illicit goods onto prison grounds. Corrections officials across the U.S. have reported an uptick in the last few years of drones flying over penitentiary walls to deliver everything from cigarettes and pornography to drugs and weapons to inmates. Prison officials in Michigan last spring found a small toy drone on the grounds of the Charles Egeler Reception and Guidance Center.