Yes, that is not positive evidence however.
> it is easy to hide both intentional and unintentional flaws
Easy in what way? I don't think it is easy to plant flaws nor easy to keep them hidden.
> Certainly there is a huge motivation to use modern devices
Doesn't mean it's possible.
> who knows what's possible with the total cooperation of manufacturers?
Why assume "total cooperation"? The manufacturers have their reputation to lose.
Yes, that is not positive evidence however.
> it is easy to hide both intentional and unintentional flaws
Easy in what way? I don't think it is easy to plant flaws nor easy to keep them hidden.
> Certainly there is a huge motivation to use modern devices
Doesn't mean it's possible.
> who knows what's possible with the total cooperation of manufacturers?
Why assume "total cooperation"? The manufacturers have their reputation to lose.