In the past, laminated glass was usually installed in the windshield, with side and rear windows being tempered only.
The difference is that tempered glass is per-stressed so that when it cracks, it shatters into many tiny and dull pieces. Laminated is the same thing, but with layers of plastic sandwiched with layers of tempered glass. Laminated glass will still shatter, but will be held together by the plastic layers.
In an emergency, small improvised, or purpose built tools meant to shatter tempered glass will be useless if the glass is laminated.
This is coming up because of the recent drowning, right? Is someone saying the driver was unable to escape because she was unable to open a back door? It would make sense of there was an issue with rescuers unable to break rear windows, but how is the inaccessibility of the internal rear door emergency open cord relevant to this case?