He was freed Saturday after 29 months in prison.
The 71-year-old businessman was arrested for allegedly giving money to a rebel group.
Taghavi says he was asked to deliver $200 as a favor for an acquaintance and didn't know who was receiving it.
The group Taghavi was accused of supporting has been connected to a 2008 mosque bombing. He was never charged and denies knowingly supporting the faction.
As a condition of his release, Taghavi met with some of the people hurt in that bombing.
The Associated Press contributed to this report.
