Twelve persons, arrested in 2006 for their involvement in the July 11, 2006 serial train blasts case, were acquitted by the Bombay high court on Monday.
The development assumes significance as under MCOCA, a confession does not have evidential value if it is not a voluntary and true disclosure.
Thirteen accused in the case are in custody under the provisions of Maharashtra Control of Organised Crime Act
The 13 accused had earlier refused to participate in the trial and pleaded against the charges framed against them by the court, saying that they wanted the trial to be transferred to another court.
With this, the number of arrests in the Malegaon case has risen to seven.
A special court on Monday allowed the Anti-terrorism Squad to conduct narco analysis tests on three accused in July 11 train blasts case.
The accused Asif Khan Bashir Khan alias Junaid was arrested from Belgaum.
The National Investigation Agency on Thursday told a Mumbai court it has found no evidence to link nine Muslims arrested in the 2006 Malegaon blasts case to the terror attack, a move that could see them walk free.
Charges against eight Muslim youths accused in the 2006 Malegaon bomb blasts case were on Monday dropped by a special court in Mumbai due to lack of evidence against them.