SCOTLAND needs its own laws to fight human trafficking and slavery, a Labour MSP will tell members of the House of Commons today.

Jenny Marra is to give evidence to a committee set up by Theresa May, the Home Secretary, to draft the UK Government's Modern Day Slavery Bill.

Ms Marra said she welcomes the plans but argues that as services involved such as the police are devolved, Scotland should have its own specific legislation.

She drew attention to the release of three women last week from a house in London after being allegedly held as slaves for 30 years and said legislation to address trafficking and slavery was timely. A couple have been arrested over the allegations.

She said: "With the introduction of Modern Day Slavery Bill in Westminster we now have new anti-trafficking legislation going through in Scotland, Northern Ireland and England and Wales, and it is important we work together to make each Bill the best it can be."

In September Ms Marra launched proposals for the Human Trafficking (Scotland) Bill, which is out to consultation until December 6.

Currently, human trafficking offences in Scotland fall under two separate laws - the UK Asylum and Immigration Act and the Sexual Offences (Scotland) Act.

Ms Marra believes bringing the offences into a single law and giving a new criminal definition of trafficking would make it easier to bring perpetrators to justice.

More than 90 people were trafficked into Scotland in 2011, according to the most recent figures, with most forced to work in the sex industry.

The Scottish Government held a summit on human trafficking last October where it agreed to introduce a new statutory aggravation offence, which will require courts to take into account any link between any other offence and people-trafficking activity.

The Scottish Government does not appear to be in favour of separate Scottish legislation.

While it has said it will look carefully at Ms Marra's proposals, Kenny MacAskill, the justice minister, has indicated he would "explore with the UK Government the possibility" of the UK Bill covering Scotland. A Scottish Government spokeswoman said last night: "We note Ms Marra's consultation on a proposal for a Bill and will give careful consideration to any Bill brought forward on human trafficking."