Final answer:
Judy Hopps discovers Nick Wilde's true con intentions in 'Zootopia' by observing his scheme of buying a jumbo ice pop, melting it down, and selling it as smaller pops at a profit.
Step-by-step explanation:
You've inquired about how Judy Hopps discovers Nick Wilde's con in the movie Zootopia. Judy, who starts as a naive rookie cop, first assumes that Nick is just an innocent ice cream purchaser. However, she discovers his true intentions when she follows him and observes his cunning ice pop hustle. After purchasing a jumbo pop, he and his partner Finnick melt it down and refreeze it into smaller pops to sell at a profit, while Finnick pretends to be Nick's baby. Judy's recognition of the con is a key moment in her development as a police officer and serves as a catalyst for the partnership between Nick and Judy in solving the larger mystery in Zootopia.