Ifechukwu Dennis was released from Kuje Correctional Centre after months in detention.
Nigeria Police file fresh charges against him at the Federal High Court.
Sowore vows to challenge the new prosecution, describing it as persecution.
Case centres on...
Faruku Musa Haruna and other farmers in Kumfada used to pool their money to buy plastic sheets, trapping enough water to irrigate small patches of land. They wanted to keep farming after the rains, but their ambitions depended on how much water they could save.