How do they do broken glass?

When the interrogation room glass, break room, and host's office glass gets broken, the glass doesn't look tempered the way it would be in real life especially in a police precinct.

Does the fake, easy-to-break glass look like that? Why would glass that's meant to break break into shards rather than little gems the way tempered glass does? Or spiderweb without falling apart like laminated glass?