Two policemen were sentenced to 10 years in prison on Tuesday and the other to eight years over the February death of Justin Zongo.
Zongo’s family said they agreed with the verdict.
Uprisings began in the impoverished West African nation in late February when students protested over accusations that Zongo was mistreated while in custody. The government said he had meningitis.
The unrest spread across Burkina Faso. Soldiers started a mutiny that threatened President Blaise Compaore’s 24-year rule.
Compaore tried to stem the unrest by dissolving the government and removing the country’s security chiefs.