Math can be structured and proven verifiably true or false. Things are labeled as conjectures when it's unknown if it's true in all cases. In less formal fields (all other scientific fields) there are more unknowns since experimentation failures cause issues. As the scale of the experiments' unknowns increase so does the difficulty for reproduction etc...
Psychology, sociology, economics and other high level scientific forms have so many unknowns that it's extreamly difficult to verify if a claim is scientifically true so its not surprising to me that fraud is easier in these fields than others.
Psychology, sociology, economics and other high level scientific forms have so many unknowns that it's extreamly difficult to verify if a claim is scientifically true so its not surprising to me that fraud is easier in these fields than others.