At least Chicago PD Season 4 Episode 23 acknowledged the other two times Lindsay has left Intelligence. The DEA task force didn't last very long, and neither did her bender.

Chicago P.D. This Episode is Currently Unavailable. S4 - E23. Fork in the Road. Lindsay must navigate around CPD politics when her mother is implicated in a murder case. Aired: 05/17/2017. Related ...

On Chicago PD Season 4 Episode 23, Lindsay faces a review board just as her mother becomes the prime suspect in the murder of her boyfriend.