<P> In the FBI's Behavioral Analysis Unit (BAU), JJ acted as the team's liaison with the media and local police agencies . Though talented and helpful, she was not actually a profiler, having once declined Unit Chief Aaron Hotchner's suggestion to take the necessary classes in behavioral analysis . She works mostly out of the confines of the police stations and field offices the team visits . However, she does accompany the team on raids, and is proficient with firearms . This is made particularly clear when JJ resolves a hostage situation inside the BAU by killing the hostage - taker, Jason Clark Battle, with a single shot (Battle is a serial perpetrator of hero homicide, who lured Technical Analyst Penelope Garcia onto a date, and then shot her, in an attempt to keep his crimes from being discovered). During season six, JJ is given a promotion to the Pentagon; however, she returns in season seven as a full - time profiler, having received the necessary training . In season 9 ("200"), she is then kidnapped, and it is revealed that her year as the DOD Liaison at the Pentagon was a cover story . It turns out she was on a task force in Afghanistan, in search for Bin Laden . The team saves her, and in season 10, it is revealed she has PTSD, and hasn't been dealing with her ordeal being tortured when she was kidnapped, as well as 2 main events that happened when she was in Afghanistan, one of which includes her having a miscarriage, after a convoy was attacked . She tries to work through it with the help of Reid, who calls her on it when she disappears into the morgue one day, for almost a half - hour, after seeing herself on the table, in place of the victim . </P> <P> It is revealed in "JJ", that JJ had twice rejected a promotion to The Pentagon and hid the offers from her superiors . However, she is finally forced to transfer by "the brass ." JJ's departure reflects that Cook was let go at the beginning of season six, for financial reasons relating to the premiere of the spin - off Criminal Minds: Suspect Behavior . JJ's time at the Pentagon was revealed in depth in season nine . </P> <P> Cook later returned for the departure of Paget Brewster (Agent Emily Prentiss). In the episode titled "Lauren", JJ receives a call and returns to help the BAU find Emily and capture Ian Doyle . The episode ends with Emily presumed dead after being stabbed with a broken chair leg in the stomach . It is later revealed that Emily is alive and in Paris with JJ's help, providing her passports from three different countries and a bank account in each "to keep her comfortable". In the season six finale, JJ returns in order to tell David Rossi that she is "coming back". </P> <P> In "200", it was revealed that JJ's transfer was a backstop and that she was actually put on a task force in the Middle East with Mateo Cruz (who later became the section chief of the BAU following Strauss's death). During this time, she witnessed a mission she had pushed for fail and discovered one of the task force's informants dead . In February 2011, while overseas, she discovered that she was pregnant . However, in April 2011, following the events of "Lauren", during an attack on the task force, she was wounded and miscarried the baby . She didn't initially tell Will of the pregnancy, and it remained a secret between her and Cruz . In "The Forever People", when she starts showing signs of PTSD, Reid calls her on it, and he tries to help her and talk to her . She eventually admits she had a miscarriage due to the attack on her convoy, and asks him to keep it between them . </P>

When does jj come back to criminal minds season 6
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