The ringleader of the scheme was named as William Singer, owner of Key Worldwide Foundation and a company called Edge College & Career Network.
Loughlin's attorney Marc Harris noted that the actress is under contract for two additional projects filming in Vancouver in April and May, as well as production on a series beginning in July. She was finally released from custody late Tuesday, exiting the courthouse to throngs of reporters. In an open letter, Mamet said: "That a parent's zeal for her children's future may have overcome her better judgment for a moment is not only unfortunate, it is, I know we parents would agree, a universal phenomenon".
The Emmy victor, 56, was among 46 wealthy folk whom the authorities said had resorted to fraud, bribes and lies to get their children admitted to elite colleges.
The actress, who is married to William H. Macy, is expected to appear in a Boston court on March 29 for a preliminary hearing into the case.
Desperate Housewives star Felicity Huffman and Full House mainstay Lori Loughlin were among 50 individuals charged by the Federal Bureau of Investigation in relation to an alleged fraud scheme to secure admissions for students at elite American universities.
Court papers said a cooperating witness met with Ms Huffman and Macy at their Los Angeles home and explained to them that he "controlled" a testing centre and could have somebody secretly change her daughter's answers.
A federal judge says "Full House" actress Lori Loughlin (LAWK'-lin) can be released after posting $1 million bond in a case in which she and her husband are accused of paying bribes to get their daughters into college.
Dozens, including Huffman, the Emmy-winning star of ABC Studio's Desperate Housewives, were arrested by midday on Tuesday.
A Hallmark Channel spokeswoman said the network hasn't decided what effect, if any, her arrest will have on programming.
The coaches worked at schools such as Yale, Stanford, Georgetown, Wake Forest, the University of Texas, the University of Southern California and the University of California at Los Angeles.
"For every student admitted through fraud, an honest, genuinely talented student was rejected".
Stanford sailing coach John Vandemoer on Tuesday pleaded guilty in Boston.
Several defendants, including Huffman, were charged with conspiracy to commit fraud, punishable by up to 20 years in prison. A former Yale soccer coach had pleaded guilty before the documents went public and helped build the case against others.