Pitchers will be ejected and suspended for 10 games for using prohibited foreign substances to physician baseballs in a crackdown by Major League Baseball that will begin Monday.

The commissioner’s office, reacting to document strikeouts and a league batting average in a more than half-century reduced, said Tuesday that minor and major league umpires will start normal checks of all pitchers, even if opposing supervisors don’t ask inspections.

While suspensions would be with pay, repeat criminals would receive innovative discipline, and teams and club workers are subject to discipline for failure to comply.

“After a comprehensive process of repeated warnings without effect, collecting information from current and former players and others throughout the sport, two months of comprehensive data collection, listening to our lovers and thoughtful deliberation, I have determined that new enforcement of foreign materials is needed to level the playing field,” baseball Commissioner Rob Manfred said in a statement.

“I understand there is a history of foreign materials being used on the globe, but what we are seeing now is far different, with much tackier materials being used more frequently than ever before. It is now evident that using foreign substance has normally transitioned from trying to find a better grasp on the ball into something else — an unfair competitive edge that is developing a lack of activity and an uneven playing field.”

The last pitchers suspended for using foreign materials were Baltimore’s Brian Matusz and Milwaukee’s Will Smith for eight matches each in May 2015. Both depended, and Smith’s penalty was cut into six matches while Matusz’s ban was faked.

The perception of an increased utilization of foreign materials, tied to a fall in crime, is seen as the largest instance of widespread cheating in baseball because the growth of steroids, which ended in the adoption of arbitrary drug-testing with penalties ahead of the 2004 season.

Yankees genius Gerrit Cole, singled out by Minnesota Josh Donaldson for a fall in spin rate in a June 3 beginning, dodged a question last week about whether he had used a Spider Tack, a sticky substance constructed for use by Strongman competitions.

“I don’t really know how to answer this, to tell the truth,” Cole said. “There are customs and practices that were passed down from older players to younger gamers, from the last generation of players to the generation of players, and I think there are a few things which are certainly out of bounds in that regard.”

MLB advised teams on March 23 it might boost tracking and initiated steps that included collecting balls taken out of play from every team and analyzing Statcast spin-rate data.

“Based on the information collected over the first two months of the season — including numerous complaints from place players, pitchers, umpires, coaches and executives — there’s a prevalence of foreign substance usage by pitchers in Major League Baseball and during the minor leagues,” MLB said.

“Many baseballs gathered have experienced dark, amber-colored markings that are sticky to the touch. MLB recently completed extensive testing, including testing by third party researchers, to ascertain whether the use of foreign materials has a material impact on performance. That research concluded that foreign substances significantly increase the spin rate and motion of the baseball, providing pitchers who use these chemicals with an unfair competitive advantage over hitters and pitchers who don’t utilize foreign materials, and results in less activity on the field.

“Additionally, the foreign substance use seems to bring about a style of pitching where pitchers sacrifice place in favor of spin and speed, especially in regards to elevated fastballs. The evidence does not suggest a correlation between improved hitter safety and using foreign materials.”

The expected clampdown already appears to have had an impact.

Fastball spin speeds dropped 2,306-2,329 revolutions per minute per week from the start of the season though June 5, based on MLB Statcast data.

The average climbed to .247 in the week of June 6, lifting the year moderate to .238.

“This is not about any player or club, or putting blame,” Manfred said. “It’s about a collective shift which has changed the sport and has to be addressed. We’ve got a duty to our lovers as well as the generational talent competing on the area to remove these materials and improve the match.”

The players’ union said it was reviewing the memo and did not have immediate comment.

Players suspended for violations won’t be replaced on the active roster.

Rosin bags will continue to be permitted but rosin cannot be combined with sunscreen or other materials, and pitchers have been told not to use sunscreen following sunset in outdoor stadiums and to not use it in all in indoor ballparks. Umpires will inspect rosin bags prior to matches to make sure they are standard.

As part of the initiative, umpires will check all novices multiple occasions and all relievers either in the end of the first inning or when eliminated, whichever occurs first. Caps, gloves and palms will be checked. Umps may also check when they detect sticky balls or if perceiving a pitcher going to his glove, cap, belt, uniform or body in a way that may be to retrieve or apply a substance.

Catchers will be subject to regular inspections and position gamers may be searched.

Pitchers will be responsible for foreign materials found on catchers and position players. A position player won’t be ejected for ownership of a foreign substance unless the umpire determines the player was employing it to a ball to help a pitcher.

Violators are subject to ejection and conclusions aren’t subject to replay review. Refusal to allow inspection will be assumed to have broken rules and will be ejected. Club employees who help players in using or masking foreign substances or who refuse to cooperate or who don’t report offenses will be subject to penalties and suspensions.