As he mentioned, Dubai is notorious for strict drug laws. They use scientific instruments to test for even trace amounts of illegal substances on travelers coming in the airport and prosecute those that test positive. If someone died as a result of this accident, Sergio will be required to pay "blood money" to the family of the victim. This blood money can be quite a bit, but is typically several hundred thousand in U.S. equivalent cash. If he is prosecuted for drugs, he can spend several years in lockup. If drugs are deemed to have impaired his driving ability, it could be a lot more.
Something a lot of expats learned during the 2008 financial crash is that Dubai also has debtor's prison. This is the reason for all of those high end BMW's and Mercedes being abandoned at the airport during the financial crash. If you take on debt and don't it back in a timely manner, you go to prison.