BOSTON — A former Boston police detective has been sentenced to probation for lying to federal officials so he could fly armed on personal trips and allow a friend to avoid going through airport security.U.S. Attorney Andrew Lelling says 53-year-old Bruce Smith was sentenced Wednesday to one year of probation and fined $7,500.Smith agreed to plead guilty in September to making false statements to the Transportation Security Administration and Department of Homeland Security and unlawfully entering a secure airport area with the intent to evade security requirements.