Infrared lasers work even in a backpack/locker/etc

Issue Description:

Tripwire laser mines (chem grenades using infrared as detonator) will check in the direction they're set even if they are in a container. Logically, the laser shouldnt pierce through?

What did you expect to happen:

Nothing.

What happened instead:

Tripwire is triggered by somebody walking in front of a locked locker.

Why is this bad/What are the consequences:

Makes it much easier to hide tripwire mines. Not logical.

Steps to reproduce the problem:

1. Make a tripwire mine chem grenade
2. Set it to activated, with any direction or invisibility setting
3. Walk in front of it in the direction set, boom

When did the problem start happening:

Likely long living oversight