BBC News
By Luke Sproule
image captionThe first lorries to cross the sea border arrived in NI on 4 January
Staff working for Northern Ireland s Agriculture Department (Daera) at border posts at Larne and Belfast ports are returning to work on Wednesday, more than a week after the department temporarily suspended physical checks at the ports.
BBC News NI examines the events leading up to checks first being suspended and what has happened since.
1 January: The Irish Sea border comes into effect
The end of the Brexit transition period sees the Irish Sea border come into effect.
Mid-January: Anti-protocol graffiti begins to appear