It is possible that this bill contravenes some provisions in some treaties; it is also possible that it does not. It will be up to the committee to determine that. In my view, the bill in itself does not violate the Constitution. It has to comply with it just like any other bill. That is something the committee will have to check in order to ensure that a bill is agreed to on its substance. The only remaining problem is to make sure that it complies with the existing treaty. That could be established in the parliamentary process.
On June 19th, 2012. See this statement in context.