My precautions taken were deemed appropriate. I always double check everything before leaving my classroom (and did this time). The difference here is that a student that was not even suppose to be on campus went into my room unsupervised through an adjoining classroom.
I had discussed a locking tank with administration at the start of the year and was told it sounded like overkill. While I agree that the responsibility is mine, I also don't want to come across as negligent. My students know better and are watched constantly. This issue happened because the thought of worrying about other students didn't cross my mind.
Sent from my Kindle Fire using Tapatalk 2