Given the following string:

u'\x000'.encode('utf-16')

chardet.detect as of 2.3.0 reports this as 'UTF-32LE' with a confidence of 1.0, but attempting to decode it as such fails with

UnicodeDecodeError: 'utf32' codec can't decode bytes in position 4-5: truncated data

I found this bug using Hypothesis. I'd be happy to submit a pull request adding the test that found it if you'd like me to, though it is of course currently failing.