I don’t think under current Constitutional precedent a warrant is required to retrieve information exchanged with a third party voluntarily from that third part

I don’t think under current Constitutional precedent a warrant is required to retrieve information exchanged with a third party voluntarily from that third party. Smith v. Maryland is probably the most relevant case: https://supreme.justia.com/cases/federal/us/442/735/ https://supreme.justia.com/cases/federal/us/442/735/