Can they truly reflect real and sudden changes in the demographic composition of the various police forces?

BBC: Doubts affect inconsistent police disability statistics

American officials say that they monitor closely the ethnic composition of the Afghan security forces for any hints of ethnic tension.

NEWYORKER: After America

It would be equally unrealistic to suppose that employers can eliminate, or discover and explain, the myriad of innocent causes that may lead to statistical imbalances in the composition of their work forces.

FORBES: Wal-Mart v. Dukes Ask Courts To Fix The World

"We can and will change the size, the composition, the character of our nuclear forces in a way that reflects the reality that the Cold War is over, " Bush said.

CNN: Bush suggests junking missile treaty with Russia

"Additionally coalition forces will realign battle space as necessary based on the composition of the coalition, the readiness of the Iraqi security forces and the threat situation, " Matern said.

CNN: Coalition nations leave Iraq as security improves

Their chemistry and composition offer direct evidence of the forces that shaped the creation of the solar system, experts said.

WSJ: Asteroid Vesta Gets a Close Study