The voice is not quite perfect on this sentence, as of August 7th, 2017, so I've taken the liberty of re-recording it.
As Helen writes in her top-level comment, the stress is wrong in the word förhörda.
Please find a correct recording on http://duolingo.vydea.io/3b53f17b2d6d45b0a59447f133c5f431.mp3
For more info on re-recordings, please check the info thread: https://www.duolingo.com/comment/23723515
Thanks for listening. Ha en bra dag! :)
You can find some statistics on this by searching for the European Social Survey- trust in Justice. Sweden seems to be slightly more comfortable with its' police than the average European country, though not dramatically so. About 5 out of 6 survey respondents agreed with the statement "the police generally make fair and impartial decisions"; this is about the same as the share in the UK, Germany and Norway. Interestingly, Finland, Denmark and Spain are significantly more confident in their police (about 9 out of 10 agreeing), while France and Poland are significantly less (only 2 in 3 agree). In Russia, less than half agree that the police are generally fair and impartial.
Sweden is average in terms of whether they think ethnic minorities or the poor get a fair deal from the court system. However, it seems few Swedes think there is much bribe-taking in the justice system. (The UK and Germany think their countries are a little more corrupt, Spain and France significantly more and Russia is a massive outlier).
My personal opinions as a native speaker of Swedish:
It doesn't sound strange to always pronounce the V in blev.
When speaking quickly everyone may (but doesn't have to) skip the V in blev.
Some Swedish dialects skip the V in blev even in slow speech, but if you don't speak such a dialect it may sound strange to skip the V, especially if you speak really slowly or if someone asks you to repeat what you've just said.
In my daily life I may intentionally skip the V when speaking slowly, but saying "ble" instead of "blev" makes me sound more like a farmer than a lawyer.
From what I got, "s-passive" is for stressing the action, "vara-passive" is for stressing the results and "bli-passive" is for treating the changing of state, right ?
In which context would bli-passive be appropriate for this sentence Or is there another reason for the use of bli-passive?