I really hope that untraceable shots fired on arriving patrol officers isn't going to be the new way that the bad guys keep police officers from their neighborhoods. I recently read here that there are some neighborhoods that the police just don't respond to. is this why?

Detroit Officer Shot in Back on Thursday Night
"The officer, who was in the passenger seat, and her partner were in the Ferry Park and Linwood streets area responding to reports of shots fired when someone shot at them, Stephens said.
One bullet pierced the squad car and hit the officer in her back, Stephens said. The officer's protective vest stopped the bullet, Stephens said.": http://detnews.com/article/20111028/...#ixzz1c5bOQsXZ

And on Wednesday morning, Fox News reported that, near Grand River and MLK this occurred:

"While the officers were investigating and a lieutenant was on scene, there was shots fired in the area," Jaafer told us.
There were more than ten shots. Sources said officers couldn't pinpoint exactly where the bullets were coming from or if the shooters were actually aiming at them.
Officers also don't know if the suspects were the ones that were firing the shots, but they are certainly facing a lot of questions.
Two of the men who were taken into custody may be connected to home invasions in the Woodbridge area.