Q. Where can I find some information about misconduct of prosecutors?

If you are looking for academic sources, the COM library databases are a good place to start.   The Court Systems and Practices library guide (linked below) outlines the best databases to search on the Articles tab.

In the databases, do a basic search for prosecutorial misconduct.  You can then reduce the results with the filtering options on the left.  You could also search for prosecutorial misconduct Texas.

In the course of looking through these articles you are likely to come across the names of specific prosecutors who have been accused of misconduct (Texas prosecutor Ken Anderson is a recent example).  Once you do, you can do new searches for the prosecutor's name to find more material about them.  If it's a common name, try adding misconduct to the search to reduce the number of irrelevant articles (ex. Ken Anderson misconduct).

There are also some useful resources available through the Internet, such as The Innocence Project.