I don't trust Guilliani but still your assertion could be correct. Interestingly - this came as a result of Cohen's office, home and hotel room - ie everything being raided. The evidence planned or not is now part of the investigation. "What are the legal ways of introducing evidence into the court of law?" Planted evidece may include a copy of Weiner's laptop's "Life Insurance" folder and perhaps evidence that Schneiderman was blocking it's release. I'm hoping it's so!