The Justice Committee took evidence from CARE (Christian Action Research and Education) on the human trafficking aspects of the Criminal Justice bill, on 11 October 2012.
Dan Boucher from the charity explained its concerns about the bill's approach to making the law compliant with the EU directive on trafficking.
Mr Boucher said the differences between the England and Wales approach and the Northern Ireland bill would lead to "greater legal complexity" in the UK.
He said CARE had been concerned to see that England and Wales was "going for a minimalist approach", and had been disappointed to read the Northern Ireland bill as it "mimics" the England and Wales legislation.
The DUP's Jim Wells asked for CARE's view of Lord Morrow's bill, which would outlaw paying for sex.
Mr Boucher said the EU directive did not call for the banning of paying for sex, but in the terms of the Morrow bill, "we welcome that provision".
The committee also took evidence on trafficking from the Northern Ireland Council for Ethnic Minorities (NICEM).
Karen McLaughlin argued for a human rights-based approach to the legislation.
She said this should encompass the three-pronged approach of "prosecution, prevention and protection".
She criticised the bill for adopting "a piecemeal approach"