Hush - What choice would you make?

Based on the events in Hush, a policeman has to decide what is just:

-to testify against his colleagues and provide justice for the murdered boy
or
-keep quiet to "uphold the silent policeman's' honor" to defend each other
(similar to the code of the street).

Task: on your blog, write a post: What choice would you make?
Explain what and why.