Thallassery Vigilance Court ordered the authorities to register a case against him on a petition that Joseph, during his tenure as Minister in the previous Congress-led UDF government, had amassed income more than known source of his income.
The petition was filed by one K K Sahji of the Irikkur Assembly constituency from where Joseph won this time.
It was pointed out that the assets details filed by Joseph during 2011 polls and in 2016 has shown a huge increase.