27-year-old Shantanu Sharma, son of Barmer collector Madhusudan Sharma, was driving his car under influence of alcohol on Wednesday night, SHO Mahesh Nagar Ummed Singh Solanki said.
A passerby stopped his car for rash driving at Gujar ki Thadi but Sharma managed to escape, leaving his car there, Solanki said.
When police searched his car, a country-made pistol with five live cartridges and a knife were recovered. Later, they raided Sharma's house in Pratap Nagar area and arrested him yesterday.