I guess a forged document could be considered a 'weak spot.' It was sort of unsporting of us to point it out, don't you think.
Of course, when you have a strong story--that is one with evidence supporting it--you usually don't have to forge additional evidence.
Silly people think that when you forge evidence, it means that the rest of your case is crap.
Look for the weakest spot? His whole argument was so weak, it was so hard to choose.
"If it looks like a duck, and it walks like a duck, and it quacks like a duck.....you got a duck."