What does it mean that some nigerian officials applied islamic law in their jurisdictions?

Some Nigeria officials, don't follow the Nigeria Constitution.

They belief in religious law to make their decisions.

Explanation:

Jurisdictions which means the official power to make legal decisions and judgements.

In Nigeria, Sharia/islam law has been instituted as a main body of civil and criminal law in nine Muslim-majority states, and in some parts of three Muslim-plurality states since 1999.

In Nigeria some government officials take law into their hands to punish citizens.

This has in some situations brought about dictatorship, because it reduce freedom of speech and creates no room for checks in the system of government.