The High Court in Zimbabwe on Monday freed on bail Beatrice Mtetwa, a prominent human rights lawyer who was arrested last week while representing the prime minister's staffers.
Mtetwa was granted bail after an earlier bail attempt was thrown out by a lower court. She faces charges of obstructing the course of justice.
"The appellant should not have been denied bail. She is a practitioner of many years of experience," judge Joseph Musakwa told a packed courtroom which included Zimbabwean Finance Minister Tendai Biti and Constitutional Affairs Minister Eric Matinenga.
Mtetwa was detained on March 17 during a raid on Morgan Tsvangirai's communications office as she tried to help Thabani Mpofu, director for research in the prime minister's office, and three other colleagues.
Prosecutors said that Metwa hindered police investigations during the raid, which blemished a referendum on a new constitution held a day earlier.
They also alleged that three computers went missing during the raid.
The four aides to Tsvangirai have been charged with breaching the state secrecy code and impersonating the police. Two other staffers taken into questioning on Thursday were released at the weekend without charge.