Witness' evidence at green energy scheme inquiry cannot be used in any criminal case against them.
Accountants inspected 300 sites which were generating most heat after allegations of abuse in the renewable heat scheme.
A timeline of events relating to the Renewable Heat Incentive scandal which caused the collapse of Northern Ireland's government.
Arlene Foster and Jonathan Bell's accounts are contradictory - how can we find where the truth lies?
BBC News NI answers commonly asked questions about the Renewable Heat Incentive scandal.