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I live very close to work, and my boss called up for me to open the garage so she could return some folding tables. I ran down, deactivated the alarm, turned on the light, and headed toward the other end of the building to the garage. Approaching the door, I saw the shadow of footsteps under the door. How could that be,the alarm was on? Opened the door, the garage was empty. I opened the main garage door. When my boss came, I said, "I came in, turned off the alarm, turned on the light, and saw under the door, some one walking on the other side. After my boss dropped of the tables and left, I went out the side door to turn the alarm back on and leave. The light was off! There was a trail from that door to the front that looked like something was dragged. I hadn't noticed it when I came in.
Janine Melnitz: [answers the phone] Hello, Ghostbusters... Yes, of course they're serious... You do?... You have?... No kidding! Just gimme the address... Oh sure, they will be totally discreet. Thank you!
[hangs up] Janine Melnitz: WE GOT ONE!
Sounds like you had to travel a short distance between deactivating the alarm and seeing the alleged ghost. Is there any way for a person near the main garage door to tell when the alarm has been switched off? For example, by seeing you go to the alarm panel?
Consider: Another employee remembers he left something from the garage, and goes to grab it. On the way said employee sees the light come on, realises the alarm will be off, and quickly unlocks the door. He grabs the item and leaves through the other door, expecting to meet whoever it was that unlocked the building. Instead, he finds it empty, because you went the other way. Being in a bit of a hurry, he carries on out the other exit and goes home, thinking that whoever opened up will also lock up when they leave - after all, he left the garage door as he found it (locked), so it's not like he created a security risk.
This could, of course, work equally well if the mystery person was a 'she,' or a thief, or an ondageist...