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"SpaceX, NASA and the military search and rescue teams conducted joint training exercises leading up to the Crew Dragon Demo-2 launch. Those training sessions will now continue before all the next six Crew Dragon missions under contract to NASA.
In exchange for the new NASA requirements, the space agency will allow SpaceX to reuse Crew Dragon spacecraft and Falcon 9 boosters for NASA astronaut missions. NASA says SpaceX could begin reusing Crew Dragon vehicles and Falcon 9 first stages on crewed launches beginning with the second post-certification mission, or Crew-2."
https://spaceflightnow.com/2020/06/23/nasa-agrees-to-fly-astronauts-on-reused-crew-dragon-spacecraft/