“Reasonable grounds” is a legal search authority that the CBSA is very familiar with. A number of our examination authorities rely on that as a legal threshold that they need to meet before they undertake certain examinations. There's a well-understood framework that supports that and is taught at the CBSA college in Rigaud. It is well understood by officers, and they would need to be able to meet that in order to prove that to a judge.
I'm not a lawyer, so I wouldn't want to pronounce on specifically what they are, but there is a very defined set of criteria that needs to be met.