Well they finally got smart and realized they had a spy behind the plate since forever - Stat Cast, Trackman & Pitch FX. And they finally figured out they could use that data for their purpose, which is what people like Bauer have been telling them for about 3 or 4 years now.
The problem with that part of it is - what to do with pitchers like Verlander, Scherzer, Sale - grandfather them in ?? Because they have been stickied for longer than spin rate data has existed. And what of the guys just graduating to the league, knowing they need to start in the minors because that way they won't show any increase in spin rate at the MLB level since they will have been stickied for their whole career.
And testing the balls ???
What a joke
It is not like hitters and catchers don't have all sorts of stickey stuff on their hands, jerseys and everywhere else. So who is to say where and when it got on the ball.
I don't really know how serious they are yet. My guy I used to get information from (2nd hand) left the Commish's office this year, so I am not sure how much I will actually get wind of directly from the enforcement side. But this is a losing battle because selective enforcement just makes the playing field all the more uneven. You have to blanket enforce it or legalize it. And if they were to blanket enforce it, it would encompass ALL their star pitchers, and that is a pretty hard pill for teams to swallow. But with a spy behind the plate for every pitch, every game, looking for variations both up and down is the only way you will ever get there if you are serious.
Go bust Verlander then see how much his spin rate drops. Then watch for it to come up again. Better yet Sale. The amount of stickie on that guys hand could rip your jersey off if he patted you on the back.
Spin rates vary around a mean so there is a normal bounce up and down. But I have quite a bit of data I was doing research on a few years back. At some point I will try to dig it out and post some over on the pitching thread. Developed a darned interesting way of looking at it. Probably should have put up some kind of fan post about it over on fangraphs but never had the time.