Seems that whenever Gerry lies he's just mistaken. Very convenient.
Like I said earlier people tells lies because they have a need to hide the truth. The thing is people don't lie all the time so you cannot say because one lied over a specific incident they are always lying but like the boy who cried wolf it harms their credibility. It's important to find the lies then ask what truth are they trying to hide?
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So what did Gerry have to gain by deliberating lying and saying he decided not to go in by patio door but instead decided to take the very much long route? What truth was he seeking to hide?
What possible reason is there for him to want the police to believe he did that?
And more to the point why didn't the PJ officer ask him why he would make such an irrational decision over which door he walked to - when the only reason for his visit to 5A was to check on the children? Why didn't it occur to him that no normal person would deliberately take the long way round and want to clear that point up with GM
So why didn't the PJ officer ask ''Why did you decide take the long route round to the front door- when it was so much quicker to just go up the steps and go in by the back door?
IMO the reason why the PJ officer did not pick up on that glaring anomaly was because at that first interview neither he nor the interpreter were familiar with the layout of 5A and somewhere along the line genuine misunderstandings arose between the three of them over the doors. If he had asked Gerry that obvious question I mention above - I reckon it would have been cleared up there and then.
For whatever reason the error first occurred - it was corrected at the next interview. Does Amaral mention that in his book? If not then IMO that is another example of Lying By Omission.