It's also a hugely serious offence to plant evidence. Whoever planted it or is willing to shrug it off if it was should be fired immediately. It casts a huge shadow over ALL other evidence and can even throw out a case. That's not helping the family if the case is upturned is it? Whether SA is guilty or not, the police brushing off the idea of planted evidence is shocking and incredibly unprofessional.
It's certainly obvious to anyone with even a casual interest in current events that police are perfectly capable of lying or planting evidence. They are human beings, with all the frailties and flaws we are all heir to. Human beings wearing the badge have committed every crime known to us. Any number of videos available on YouTube is proof of that. It is undeniable.
The spokesperson for the officials in charge of the investigation were not there. They have no first hand knowledge of how this key entered the evidence stream. LE has a clear motive to lie in this matter, if they even know the truth. But the confident statements standing behind the integrity of their subordinates have not always borne out. This is an historical fact.
Maybe it really was there where cops would have to practically step over it to enter the bedroom. Or maybe it squirted out of a secret compartment in the side of a wooden bookcase when a frustrated honest cop shoved some soft *advertiser censored* magazines into the furniture. Or perhaps a law enforcement officer, out of misplaced zeal, found the key elsewhere and decided to place it there for some reason while honestly thinking there was 'no harm' in framing a guilty man. Or perhaps the LE placed the key there as part of a deliberate plan in collusion with one or more others to incriminate SA.
KK rhetorically admitted the key was planted, suggesting to the jury something along the lines 'even if the key was planted that does not bear on the other evidence'. You are correct:
"It casts a huge shadow over ALL other evidence." Planted evidence gets out of the law enforcement screen, gets through the District Attorney's screen, and gets presented to the jury as fact and we should ignore it? Remember the jury stands in for
us - the citizen 'peers' of the accused. How can we trust someone who may have lied to us? KK thinks dubious evidence entered by the prosecution isn't relevant to the state of their quality control. If the key was planted that is evidence of the state of the investigation. Was it honest?
Time and time again we have examples of ways the investigators in this case deviated from common sense protocols the prosecution crossed lines (to cite a couple, blocking
Coroner Debra Kakatsch, or allowing officers from the most likely department to bear a grudge against SA to roam the search area). Sheer incompetence can't explain these. But if it
can, that says something significant about the trustworthiness of the investigation as a whole.
Attempts to brush these considerations off are suspicious in themselves.