When the Coalition Provisional Authority came to Baghdad it had passed a set of laws in May 2003 known as the CPA laws. The CPA was the temporary government of Iraq and the existing laws in Iraq were still in force unless it was superseded by the CPA laws.
When the New Iraqi Interim government was appointed in June 2004, a new set of laws were in place known as the Transitional Administrative Laws (TAL) which were to govern the affairs of Iraq during the transitional period until a duly elected government, operating under a permanent and legitimate constitution.
The new transitional government embraced the CPA laws because they did not make any new laws. The TAL did not supersede any existing laws to include the CPA Laws.
This law shall remain in effect until the permanent constitution is issued and the new Iraqi government is formed in accordance with it.
Iraq abides by the rule of law; the new Iraqi parliament has to enact new legislation to supersede laws (like CPA Laws and the TAL) and any Iraqi laws currently in place.
Although the Iraqi constitution was approved by the voting population it still needs to be ratified by the legislative body.
Today, the new government just completed, no new laws enacted, but Iraq is still trying saddam in a Iraqi Court, how??
The old CPA laws, TAL laws along with Iraqi laws are still in effect until changes are made by the new Iraqi government.