What Happened Last?

The case file

Someone got into the school after hours. The logs below are all verified -- the order has to be reconstructed. What happened last?

The rule: Every finding below comes from a verified log. Reconstruct the order of events.

The clues

1. The sensor log shows the gym motion sensor firing at 10:39 PM, after the 911 call being placed.
2. The door sensor log shows the gym door sensor tripping at 10:55 PM, before the corridor camera flagging motion.
3. The phone log shows the 911 call being placed at 10:31 PM, after the alarm tripping.
4. The camera log shows the corridor camera flagging motion at 11:03 PM, before the janitor's closet keycard being used.

Who did it?

1. the janitor's closet keycard being used
2. the gym motion sensor firing
3. the 911 call being placed
4. the gym door sensor tripping

The verdict is still sealed. The answer is revealed here tomorrow — or play today's case and render your own verdict now.