Cops Searching For Kansas City Chiefs Rashee Rice

7:50 AM PT -- Dallas PD tells TMZ ... "Police were called to a multi-vehicle accident in the 6600 block of northbound North Central Expressway. The preliminary investigation determined two drivers, one in a Corvette, the other in a Lamborghini, were speeding in the far-left lane." Cops add, "The drivers lost control and the Lamborghini traveled onto the shoulder and hit the center median wall, causing a chain…