Rahat will face costly music under a strict customs Act.
Khan and Maroof will be issued showcause notices, asking them to pay a hefty penalty for failing to declare the foreign money.
The DRI has already recorded the duo's statements, as well as that of their Indian agent Chitresh Shrivastava.
Khan was grilled again on Saturday.
DRI officials continued decoding about 500 emails exchanged between the show organisers and others. They also searched the premises of Shrivastava's Eyeline Telefilms in Mumbai, from where ` 50 lakh and a diary were seized.
" They admitted to accepting money through unauthorised channels," a DRI official said.
A DRI official revealed that all their payments were made in black and taxes were not paid.
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