When cops doctored evidence

Lance Corporal Rohaniza, a key witness to the murder case of the Mongolian Altantuya Shaariibuu said that the police doctored her evidence. What she said was not what the police recorded and she was under harassment and pressure from the police who wanted to record what they want. This is a clear case of blind loyalty, where justice, right and wrong were sold away to protect people in high offices. When civil servants refused to think about justice, when they blindly accepted orders, the country will go to the dogs. How is it that civil servants can be so corrupted or feared power to become accomplices of crime against fellow citizens? Do they have any conscience or they can be easily bought?