What is the reasonable suspicion standard and the use of sniffer dogs in traffic stops?

Comments about the reasonable suspicion standard and the use of sniffer dogs in R. v. Kang-Brown and R. v. A.M. are generally applicable to the use of sniffer dogs in traffic stops. Writing for the majority, Binnie J. held in R v. Kang‑Brown, at para. 25, that sniffer dog accuracy underlies the reasonable suspicion standard: The charter standard of “reasonable suspicion” is based, as stated on the minimal intrusiveness, narrowly targeted objective and high accuracy of “sniffs” by specifically trained dogs […]