This The Mentalist screencap contains
arrestzelle, arrestzelle., strafanstalt, strafvollzugsanstalt, justizvollzugsanstalt, and strafrechtliche anlage.
There might also be
gefängnis, klirren, knast, poky, pokey, jail, jailhouse, gaol, clink, slammer, zelle, gefängniszelle, maschendrahtzaun, and kettenglied.
Jane discovers an important clue to Red John's methods as the team encounters four of the suspects, and the CBI investigates the case of a software engineer killed Von a drone strike