In some implementations, determining whether a motion event candidate is a false positive includes determining whether the motion event candidate occurred in a particular zone. In some implementations, determining whether a motion event candidate is a false positive includes analyzing an importance score for the motion event candidate. The importance score for a motion event candidate is optionally based on zones of interest involved with the motion event candidate, background features, motion vectors, scene features, entity features, motion features, motion tracks, and the like. FIG. 6 is a block diagram illustrating a representative client device 220 associated with a user account in accordance with some implementations. The client device 220, typically, includes one or more processing units CPUs 602, one or more network interfaces 604, memory 606, and one or more communication buses 608 for interconnecting these components sometimes called a chipset.