Cavity search / protoscope scene in movie

Old classic movie "When you comin back Red Ryder" my favourite scene starts at 32:24 ... I would luv to be the one giving rectal cavity searches / protoscope exams in this setting. Please share your favourite strip search / exam scenes. Enjoy!

https://youtu.be/SOaROIg8f9w?si=mjVLuiGDgAOTTuEx

I don't have the context (haven't watched the full movie) - why is that exam happening?

Border crossing, suspected of smuggling contraband.