Place the chipotle chiles in a zip-top plastic bag. Add the tequila and the next 5 ingredients (tequila through minced garlic) to the bag, and stir well. Add the shrimp; seal and marinate in the refrigerator for 20 minutes. Remove shrimp from bag, reserving marinade. Place the reserved marinade in a small saucepan; bring to a boil, and cook 2 minutes. Remove from heat.
Thread shrimp onto 6 (6-inch) skewers. Place shrimp on a grill rack coated with cooking spray, and grill for 2 minutes on each side or until the shrimp are done. Serve with sauce.
Note: Place remaining chiles in adobo sauce in an airtight container, freeze or refrigerate for another use. Look for cane syrup with the other syrups at the grocery store.