2 doctors agreed: No: I know of no research that shows xenical can cause a false-positive drug test. All xenical does is block some of the fat from your diet from being absorbed, thus decreasing your calorie intake. This shouldn't cause either a urine or a blood drug test to become positive.
The total flight duration from New York, NY to Dominican Republic is 3 hours, 31 minutes. This assumes an average flight speed for a commercial airliner of 500 mph, which is equivalent to 805 km/h or 434 knots. It also adds an extra 30 minutes for take-off and landing.
The closest major airport is Logan International Airport, located in Boston, MA, approximately 24 miles from the center of Foxborough, MA. The best route from the airport to Foxborough is the following: start by heading north and turn left at toward Hotel Dr. Continue driving straight and turn left at Hotel Drive. Turn right at Harborside Dr. and again at Jeffries St. Take the ramp onto I-90 W and exit 24 for I-93.