Caroline Simoneau, a forensic investigator with the Montreal police, presented photos of bloodstained packages sent to the federal Liberal and Conservative party headquarters as well as two packages sent to B.C. schools.
She also showed the court items recovered from a trash pile outside of the apartment Magnotta lived in at the time 33-year-old Jun Lin was killed in May 2012.
Inside that trash, investigators found human remains, a deceased dog, knives, scissors and other items.
Magnotta has pleaded not guilty to five offences, but has agreed to the facts of the case, including that he killed Lin.
Because of that admission, the Crown does not need to prove the facts of the case, but does need to convince the jury that Magnotta had the state of mind to commit the crimes.
His lawyer has told the jury he intends to argue that his client should be found not criminally responsible for the death because he suffers from a mental illness. The prosecutor in the case said he intends to prove the killing was premeditated.
On Tuesday, Magnotta's lawyer Luc Leclair questioned Simoneau, bringing items into court evidence the jury had previously seen in photographs, including: copies of the daily newspaper 24H, a London tube map, a statement from the National Bank addressed to Magnotta, and several pieces of clothing.
Leclair also questioned the witness on the visibility of the area where some of the evidence was recovered.
To date, the witnesses called to testify by the Crown have all been members of the Montreal police’s forensic team.
In total, more than 60 witnesses are expected to testify during the six-week-long trial.