At the same time, Philly homicide detectives were clearing an extraordinary 80%+ of cases, well above the U.S. average.

That changed in 2014, coinciding with new policies: witnesses are told they may leave; interrogations are on video; there are time limits on questioning.
Marc Bookman of @Atlantic_Ctr told me about a 1993 case in which detectives pleaded the Fifth to avoid testifying about an investigation. There were no consequences he said: "If you want to know why the Philadelphia homicide unit was running wild for years, look at that case."
“It’s up to the jury to decide whether they’re lying now or lying then,” is how one law professor explained the Pennsylvania rule that allows this practice.

Patricia Cummings, head of the DA's Conviction Integrity Unit, calls it "a license to bad cops."
https://www.inquirer.com/crime/pennsylvania-murder-convictions-commonwealth-v-brady-20210507.html
Onyiah's lawyer, Teri Himebaugh, said she has many more cases just like his.

“What no one wants is for these cases to see the light — because once you start to open this can of worms, there are a lot of worms."

She's built a database to track it all: https://www.thepolicetransparencyproject.com/ 
Families of victims say the result is a loss of trust-- which they say makes people less likely to cooperate “There might have been a 90% clearance rate. But if now they’re getting overturned, you didn’t have a 90% clearance rate. You had a large rate of creating destruction.”
You can follow @samanthamelamed.
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