[benibela]

They closely examined the cucumber in my bag

[DoreenMichele]

Drugs hidden in a cucumber truck:

https://www.chicagotribune.com/nation-world/ct-fentanyl-bust...

Also, plants or foods are sometimes forbidden because of potential to carry vermin, plant diseases, etc.

https://www.cbp.gov/travel/us-citizens/know-before-you-go/pr...