It's called 'constructive knowledge', and is used e.g. when the source of probable cause for a search is such as would disclose methods of evidence collection which LEO'S prefer not to disclose in open court. Sometimes such methods are unlawful.
Such parallel construction methods are antithetical to the Right of Due Process, which requires the accused be able to confront his accusers and examine the legal soundness of their methodology.
In common law, there is no exception for "LEO preference to not disclose in open court."
The powers that be have construed such an exception for their convenience and financial gain (Fed. Judge salary >$200,00k) but in their hearts they know they should be absolutely terrified of the fate that awaits them (and their innocent spouses+children) once the proverbial Saxon is angry.
When BTC and XMR hit $100k/coin, there is going to so much remedial self-help Justice dished out that .gov won't be able to pay its robed whores, revenue extraction specialists, and King's men enough to make their overwhelmingly hazardous job conditions worthwhile.
Do you think we'll see those prices by the 2020 or 2024 halving?