Excerpt from Evan Drellich’s new book about sign stealing pertaining to Dodgers

From The Althletic's interview with the author. I'd link it but its paywalled.

"One member of the Dodgers said during the 2017 season, they indeed did use a baserunner scheme, determining sign sequences with the help of their video room, an analog to what the Red Sox and Yankees had done in recent years, and to what the Astros were doing on the road. Another member of the Dodgers said that everyone was doing that until MLB cracked down on it in 2018."