Accordingly, two officers were already in the area responding to a call about an abandoned cell phone, which it turned out belonged to Kercher. Knox and Sollecito claim they had already called the carabinieri when the postal police arrived to return Kercher's phone. The postal police claim that call was made later. Regardless, Knox let them into the house to investigate.
As Rolling Stone noted, the carabinieri surely would've closed off the crime scene immediately and conducted a careful inspection. Instead, the postal police let Knox, Sollecito, Romanelli, and Romanelli's three companions "tramp" through the house. They also initially refused to break down Kercher's door, prioritizing her privacy over her safety.
The chief forensics expert would not take Kercher's body temperature, a crucial test for determining time of death, until a full day after her body was discovered. As a result, the tests came back with a wide range of "sometime between 8pm and 4am." A narrower time frame could have cleared Knox and Sollecito, as they were both seen at Sollecito's apartment around 8:45pm, and his computer showed activity until 9:10pm.