Benign Intervention

Benign Intervention is a quest in Fallout 4.

Quick walkthrough

 * 1) Bring Cait to Vault 95
 * 2) Locate the clean room
 * 3) Speak to Cait
 * 4) Wait for Cait to get in the clean room chair
 * 5) Cure Cait's addiction
 * 6) Speak to Cait

Detailed walkthrough

 * 1) Once Cait trusts you enough she'll tell you about her history and her current struggles with addiction, then suggest going to Vault 95 to seek treatment.
 * 2) Head to Vault 95 in the south west corner of the map.
 * 3) The Gunners have claimed the vault, so you'll need to fight your way in.  The room on the right after leaving the elevator (locked with an Advanced lock) has a terminal that can be used to deactivate some turrets ahead.  Watch out for traps throughout the vault.
 * 4) Ahead there's a large room with several enemies, a Master level terminal blocks the door to the South that leads to the detox chamber.  Alternately in the Overseer's office in the upper west side there's an unlocked terminal that can open the door.
 * 5) Once passing by the door there's several more gunners in the cafeteria, go upstairs and around to the terminal, inside there's a Gunner Commander, turret and an active bottlecap mine on the desk.
 * 6) Talk to Cait, she has misgivings about the process.  You'll have 3 easy persuasion options, all of them give the same result.  Once she gets into the chair activate the terminal and watch the chair work.
 * 7) Speak with Cait again once it's done and the quest will end.

Bugs
The quest might not trigger after her dialogue and Cait won't talk to you upon entering the clean room. Also the elevator tends to get stuck upon entering it and activating the button.

Make sure Cait isn't in power armor before opening the door to the clean room. It will disappear as she has to be out of it in order to progress.