It wasn't enough that jurors at the federal trial of James "Whitey" Bulger had to sort out sometimes graphic testimony from 72 witnesses and the 32 criminal counts against the reputed Boston mobster.
They had to gauge the believability of unsavory criminals who had taken plea deals.
"You weren't sure what you could believe or what you couldn't believe," juror Janet Uhlar said Tuesday.
Testimony revealing deep-seated corruption in the FBI and government during Bulger's heyday left Uhlar disgusted with a justice system she called "tainted," even now.
"Almost every witness that came through for the prosecution, I just had this feeling like it's tainted. It's tainted," said Uhlar, a pediatric nurse and the author of several books on the American Revolution.
She spoke to CNN in her first interview since the jury on Monday found Bulger guilty of 31 counts.
The juror spoke succinctly when asked to describe her gut thoughts about some of the trial's key witnesses.
Bulger hit man John Martorano:
Bulger crime partner Stephen Flemmi:
"I can't cuss on TV."
Mob enforcer Kevin Weeks:
"Scary. Still scary. ..."
Disgraced FBI supervisor John Morris:
"There's no words. There's no words, absolutely disgusting. I felt like a traitor."
Still, Uhlar and her 11 fellow jurors found Bulger guilty of extortion, money laundering, drug dealing and weapons possession. They found he was responsible for 11 of 19 murders under a wide-reaching racketeering charge.
Bulger, who turns 84 in two weeks, faces a maximum sentence of up to life, plus 30 consecutive years in prison.
Uhlar called Bulger an "old, tired man" and said she wasn't convinced he was a government informant, as prosecutors had alleged.
Known as Juror Number 12, Uhlar told CNN the government "enticed" many Bulger associates to testify by giving them "extremely outrageous deals."
"When you think if Martorano killed 20 people in cold blood and basically got a slap on the hand in less than a year for each of those murders. I mean, for me, that was huge. That was huge."
Prosecuting attorney Fred Wyshak, in closing arguments, defended the government's plea deals with gangsters, three of whom together implicated Bulger in the 19 murders and various acts of extortion.
"The government didn't choose them, Bulger chose them," Wyshak said.
"The only thing worse than making a deal with (former hit man) John Martorano would have been not making a deal with John Martorano."
Wyshak said the government "held its nose and made the deal."
Uhlar criticized Morris, who testified about leaking confidential information that led to the murders of Bulger crime associate Brian Halloran and Michael Donahue, an innocent truck driver caught in the crossfire.