ESPN describes some of the additional things they will be doing. "Baseballs taken out of play -- both randomly and prioritized, if they exhibit signs of foreign substances -- will be inspected by a third-party lab, according to the memo. Balls will be tracked back to whoever was pitching when they were taken out of play.
Finally, game-day compliance officers will monitor dugouts, batting cages and bullpens for violations of the foreign substance rules while filing daily reports of their observations with the league office."
Surely a number of Twins pitchers will be affected, not just Yankees and Houston.