On the television news you catch a report about a high-profile rock group, who have (so you believe you hear) 'been detained at Heathrow Airport, on return from a sell-out European tour, for being in suspected possession of a range of band substances.'
An English friend who was watching the bulletin with you comments, a little wryly: 'Well, they would, wouldn't they?'.
What is going on here, at the linguistic level?
Your friend finds it utterly unsurprising that a band of musicians should have items in their luggage that are to do with the band itself.
At least one of you has misheard 'band' instead of 'banned', i.e. the musicians had quantities of something with them that they legally weren't allowed to bring in (probably drugs of some kind).
Your friend thinks there is nothing particularly newsworthy about a pop group being 'done for drugs'.
The police are looking to confiscate the band's souvenirs and memorabilia.