Where the US government has seized private property pursuant to a search warrant in a criminal investigation, what would happen to that property if the President were to pardon the suspect(s) under investigation?
Must it be returned immediately (perhaps before investigators have had an opportunity to examine it), or could the investigators continue their examination unimpeded? To put it another way, does the pardoning of a suspect necessarily halt all investigative activity into the pardoned crimes and effectively nullify any extant search warrants?