Co Louth based republican Thomas 'Slab' Murphy has appeared before Ardee District Court on alleged revenue offences.
The 58-year-old farmer, with an address in Ballybinaby, Hackballscross, Co Louth, made no reply when he was initially cautioned.
Detective inspector Kevin Ring of the CAB told the court that Mr Murphy, who lost a libel action against The Sunday Times for describing him as an IRA leader, was arrested in Dundalk at around 9.30pm last night.
Mr Murphy was then taken to Drogheda Garda Station where he complained of chest pains.
A doctor was called and Mr Murphy was moved by ambulance to Our Lady of Lourdes Hospital.
The court heard that the doctor who initially saw Mr Murphy believed that the accused was feigning illness.
At Our Lady of Lourdes Hospital Mr Murphy was seen by a senior neurologist who also said there was nothing wrong with him.
Later, Mr Murphy signed himself out of hospital.
Paul Tiernan, solicitor for the defendant, told the court that his client had no previous convictions and was a man of good character.
He said Mr Murphy was willing to meet garda conditions to reside in the jurisdiction and hand over his passport. The case has been adjourned pending the arrival of an independent bails person.
Mr Murphy is facing nine charges of failing to file tax returns under the Taxes Consolidation Act.
The CAB has been investigating his financial affairs for the past three years and has twice searched his home in Ballybinaby.