Mild spoilers for Season 1. I haven't (yet) watched Season 2, so please no spoilers for that.
We are told that surgical sedation disables Kilgrave's power, and somewhat demonstrated that with Ducasse's response once Kilgrave is tranq'd.
We are also shown Kilgrave's power having time-limits, and also that the victims are entirely aware of the control after the fact (assuming that it wasn't mild enough that they deny their experience to themselves).
However, In Ep 8. the next door neighbour detonates the bomb, killing herself, despite Kilgrave being sedated, and in all the police who held themselves hostage in Episode 7 don't seem to remember anything that happened.
Is there any good explanation for this, or is it just "the writers weren't too careful/fussed about that sort of consistency"?