How does the author use foreshadowing in Deadly Decisions?

In chapter twenty-eight, Tempe wonders if Kit really found the envelope containing the eye on her car. DNA analysis proved that it came from a bomb victim, but that doesn't explain how it got on her car. Her encounters with Jocelyn are becoming increasingly suspicious, and the symptoms that Jocelyn attributes to allergies might also be attributed to drug abuse. Tempe wishes she'd paid more attention when Kit made his comments about Jocelyn, and this statement can be taken as overt foreshadowing.