Ex-Joint Director (JD) of Central Bureau of Investigation (CBI), Lakshminarayana, revealed that the he handled at 28 high profile cases at a time. The investigation could be really tough as each case is unique, he said. The resources available in CBI too are very limited. The toughest case that he handled so far seemed to be the Satyam scam. This was so because the entire case depended on technicalities like inspecting balance sheets, he said. However, he was able to do it, with the help of experts in that field, he said.