Commonwealth v. Iago I.

After a jury trial in the Juvenile Court, the juvenile was adjudicated delinquent on a complaint charging him with burning a building.2 On appeal the juvenile claims that (1) expert testimony was improperly admitted and the judge failed to instruct the jury on the weight to be given expert opinion evidence; (2) prior bad act evidence should have been excluded and the failure to give a limiting instruction exacerbated the error; (3) the judge should have given a Ciampa instruction, see Commonwealth v. Ciampa, 406 Mass. 257, 266 (1989); (4) the prosecutor’s closing argument was improper; and…