Subject is exactly prison
San Francisco Chronicle prisons investigation involving undercover as a prisoner by Tim Findley and as a guard by Charles Howe.
Arizona Daily Star reporter R.H. Ring spent 10 days posing as a maximum-security convict at Arizona's Florence State Penitentiary. Very few people in the prison system knew of his stay, not even Florence's warden.
The result of three months of reporting and a week undercover in a Pennsylvania prison, this series examines the conditions, challenges, and systematic culture of the US prison system. Stories focus on California, Washington DC, South Carolina, and Pennsylvania.
Althelia Knight visited Lorton Reformatory repeatedly to document the ease with which drugs were smuggled into the institution. The trip, about 1/2 hour, was usually undertaken in a van run by a private driver, usually operating without a permit.
Shane Bauer is known for his daring undercover exposes, including his four-month turn as a private prison guard. The story, for Mother Jones, won the reporting category in the National Magazine Awards of 2017.