When someone is assessed as being at risk of harming themselves, a complex care plan is putinto place with healthcare professionals and prison staff, a spokesman said.
Even a reputation for competence was undermined in 1996 after an official report into a prison break-out put the blame on a system riddled with deficiencies.
Michael Marin was facing a sentence of seven to 21 years in prison on June 28 when courtroom video shows that he appeared to put something into his mouth and swallowed.
Earlier this month Peter Wright, the new governor of Lincoln Prison, said he thought closure was "very unlikely" having recently had a lot of investment putinto it and building still going on.