I do not take the 1 in 9 number as an error estimate. I usually refer back to Samuel Gross's
work in this area, which suggests a 4% error value in death penalty cases. There is also an interview with Professor Gross (U. Michigan law)
here. "Remember, the people who were exonerated in 2016 were not convicted in 2016. The convictions occurred on an average about 8 and a half to 9 years earlier." This is a sobering number in a different way.
He continued, "This [the existence of wrongful convictions?] is a serious problem. Maybe 2% of convicted criminal defendants are innocent, maybe it’s 4% or 3% or criminal convictions – we don’t know – but it’s a lot of people. Even if it’s 1%, that’s tens of thousands of innocent defendants convicted each year across the country. The exonerations that we know about are only a small proportion of the wrongful convictions that occur."
EDT
While we are on the subject of "sensationalistic" and just plain wrong numbers, it is worth recalling that Scalia quoted a NYT Op Ed indicating that the rate was 0.027%. As stated in the PNAS article linked above, "In fact, the claim is silly. Scalia’s ratio is derived by taking the number of known exonerations at the time, which were limited almost entirely to a small subset of murder and rape cases, using it as a measure of all false convictions (known and unknown), and dividing it by the number of all felony convictions for all crimes, from drug possession and burglary to car theft and income tax evasion." See this
link for more discussion.