Fringe : Season 2 : Episode 21 : “Northwest Passage”
Peter takes some time off from the Fringe unit, but trouble just seems to follow him around. Somehow, he manages to solve a major crime without the help of the FBI or Walter’s magical laboratory.
Saying, “These bad guys can extract information from your brain,” is too much of a stretch for Peter, and so he has to show the local police what he means. Except he just shows them what they’ve already seen (the back of Krista’s head) and explains it using words anyway.
Peter is presumably filing away at his bullets to convert them into hollow-point types, which will cause more damage on impact. Why he didn’t just buy hollow-point bullets in the first place is a mystery.
Potassium bromate (KBrO3) is a carcinogenic flour additive (delicious strawberry-flavoured death!), and is banned in Europe and Canada.
Peter’s method of tracking the killer using the timing of the victims’ adrenaline spikes is quite elegant, but ultimately implausible. Leaving aside the glaring issues of varying metabolic rates and times of death, he assumes that they were abducted violently (a shapeshifter could have taken on the image of a trusted person) and somehow has access to their adrenaline history (he would only be able to get a number for total adrenaline after death, not how that level had changed over the past few hours).