A gaping hole in school security or am I being an over reactive parent?

[Glock Shooter]

Thanks for the replies and I'd like to hear more. For clarification, the music teacher said that she did NOT recognize the stranger and actually said she felt the need to get my daughter back in the classroom.

[Irving]

I remember a lot of guest speakers a lot as well. Reading the post, the thing that I am most surprised about is that it doesn't sound like the teacher made any attempt at asking the guy who he was. Perhaps she thought it the better plan to get back to the rest of the students and call the front office from her class room. Still wouldn't have been a big deal to ask who the hell he was.