Arnold, 23, turned himself over to authorities last week and remained in jail on Monday when a judge set a $1 million bond for him, denying a prosecution request he be held without bond.
The judge, Chief Circuit Court Judge Christopher Sabella, also refused to order an ankle monitor as a condition of bond.
Arnold was ordered to stay at his home in Tallahassee except while playing, traveling or training with an NFL club, only to be dropped by the Lions hours later.
Four charges against Arnold were for robbery with a deadly weapon or firearm and four others were four kidnapping, the Hillsborough County Sherriff's Office told the NFL's website.
Charges carry a potential life sentence in prison.
Arnold was allegedly involved in a plot to detain and beat three people he believed had stolen from him while a representative for Arnold said the defender "categorically denies any involvement in the matters underlying the allegations made against him and maintains his innocence."
Arnold started 22 games in 24 appearances for the Lions over the past two seasons, making 91 tackles, deflecting eight passes and making an interception.