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Richardson was one of four assistant head coaches arrested in the financial scandal. USC's Tony Bland, Auburn's Chuck Person and Oklahoma State's Lamont Evans were also arrested. 

While the FBI is still investigating the allegations and the program's future is a blur, here are the best Twitter reactions following Richardson's arrest: 

I spoke with former Arizona guard Mark Lyons who's also from New York about Book Richardson's allegations. This is what Lyons said:

— Justin Spears (@JustinESports)

Trey Mason once upon a time was a walk-on guard at Arizona. Mason played at UA for three seasons, but left the program in 2016. 

Unfortunate for Book to go down for shady behavior of an entire program

— Trey Mason (@TreyBall3)

Book Richardson could spend the rest of his life in jail. For giving a kid $15,000. To play basketball. And go to college. Got it.

— Tyler Hansen (@tylerhansen1)

This Book Richardson news is so sad and annoying 😶

— christian flores (@christianjflo)

Book Richardson has stained our program. Future now looks uncertain. We are obviously going to lose Quinerly. What else will happen? 😓

— Alex (@AlexProspero28)

Shareef O'Neal is the son of NBA legend Shaquille O'Neal, and a 6-foot-8, 205-pound power forward out of Santa Monica, California. He is ESPN's 24th ranked recruit in the Class of 2018. O'Neal committed to Arizona in April 2017.

Never change up

— Shareef O'Neal (@SSJreef)

LOYALTY LOYALTY LOYALTY

— Shareef O'Neal (@SSJreef)

This is about Arizona. Jahvon Quinerly committed August 8.

— Chris Stone (@cstonehoops)

Reading this complaint, looks like Book Richardson paid Jahvon Quinerly's mom 15k to commit to Arizona. Wow!

— Chris Blessing (@C_Blessing)

Best one yet

— Jimmy D (@jdandrea21)

Whoopsie....

— Dan Trujillo (@pixelmandan)

Sean Miller and John Calipari this morning

— Zach Schwartz (@ZachisZach)

Live look at Bobby Hurley and his staff.

— Don Drysdale Jr. (@DJ_Drysdale)

During the U.S. Department of Justice's press conference in regards to the investigation Tuesday, the FBI investigators came prepared with a flow chart of how the assistant coaches accepted bribes. 

The FBI is out here with flow charts explaining the NCAA / Adidas bribery and fraud schemes

— Eric Rosenthal (@ericsports)

The FBI is out here with flow charts explaining the NCAA / Adidas bribery and fraud schemes

— Eric Rosenthal (@ericsports)

Significant to say the least. Tony Bland and Book Richardson are among the best recruiters in the Pac-12.

— Jeff Eisenberg (@JeffEisenberg)

Arizona basketball was scheduled to have media day Wednesday, Sept. 27 at 2 p.m., but the university released a statement that it would be cancelled. 

Arizona has postponed its men's basketball media day -- which was set for tomorrow. Probably a smart idea.

— Jeff Goodman (@GoodmanESPN)

Arizona football has a bye week and Arizona basketball has media day tomorrow, this week would should be easy. FBI:

— Justin Spears (@JustinESports)

Lost in all the Emanuel Richardson coverage today are the countless outlets misspelling his name as "Emmanuel."

— ðŸ�€ Ben Leibowitz 🦉 (@BenLebo)

Book Richardson was released on $50,000 bond after making an appearance in federal court today.

— Bruce Pascoe (@BrucePascoe)

Richardson faces a maximum of 60 years in prison and/or a fine of $1.5 million.

— Bruce Pascoe (@BrucePascoe)