Rahul Mahajan, son of the late BJP leader Pramod Mahajan, on Friday filed a caveat in the Supreme Court to preempt any possible move on the part of Delhi Police to get an ex parte order against Delhi High Court’s direction staying his brain mapping test in the drug snorting case. ‘‘Yes we have filed a caveat in the Supreme Court in connection with the High Court order in this case,’’ Ankur Chawla, one of the counsel representing Rahul, said. “Now, if the Delhi Police moves the apex court against the High Court order, the former would not pass any orders without hearing Rahul’s counsel.”