Revelations that a single senior Houston police officer served on at least ten grand juries have been an eye-opener to those who might have assumed that the grand jury as constituted in Harris County (Houston) was random or representative in its composition. Radley Balko:
…critics allege that the “key-man” system that many Harris County judges use to pick grand jurors selects for law enforcement officials and their friends, family, and acquaintances. Critics say it’s too easily manipulated, and results in grand juries continually picked from the same pool of people — cops, retired cops, friends and family of cops, and older, whiter, wealthier, more conservative people who both have the time and money to serve, and are familiar enough with the system to even know to volunteer to serve on a grand jury in the first place.
Adding to the problem, grand jury members are invited to go on police ride-alongs, are given free time at police shooting ranges, and are invited to participate in 3D shooting simulators designed to make them empathetic with police officers. Those same grand jurors are then asked to assess the validity and credibility of the police officers who testify before them, not just in routine investigations, but in investigations of the killing of police officers, alleged abuse by police officers, police shootings, or police corruption.