DETROIT—Charged up by strong sales of its electric cars and SUVs, Tesla on Monday posted its seventh-straight profitable quarter. The company made $438 million in the three-month period that ended March 31, as sales more than doubled the same period last year to nearly 185,000 vehicles. Tesla said adjusted net income, excluding stock-based compensation, passed $1 billion for the first time in company history. The company also said that there is evidence that a person was behind the wheel of a Tesla that crashed in Texas earlier this month, killing two men. But authorities near Houston said investigators are sure that no one was driving the car when it missed a curve, hit a tree, and went off the road. The April 17 crash near Houston has brought renewed scrutiny of Tesla and its Autopilot partially automated driving system. Two federal agencies are joining local authorities in investigating. Excluding stock-based …