And my guess is it happens way more often than you'd guess. I was quite shocked to watch a movie "Witch Hunt" http://www.imdb.com/title/tt1196112/ http://www.i

And my guess is it happens way more often than you'd guess. I was quite shocked to watch a movie "Witch Hunt" http://www.imdb.com/title/tt1196112/ http://www.imdb.com/title/tt1196112/ -- multiple people were convicted and spend many years in jail (one guy 20 years) for child molestation charges which were completely bogus (they're all now acquitted). Now you have to ask yourself, for each case where an innocent person is finally freed after 15 or 20 years, how many more just never see that justice even after a long time. What's your best guess about the fraction of people in jail that are innocent? 1%? 10%? And now think that like 1% of the population is incarcerated. How likely does it make any of us to go to jail?