The Clone Wars S03E05: Corruption

Padmé, on a diplomatic mission to Mandalore, guarantees the pacifist planet the Republic's full protection, but she and Duchess Satine soon find something sinister lurking beneath the planet's serene façade. Moogan smugglers have been sneaking in supplies, including bottled tea destined for the Mandalorian schools. To increase their profits, they have been diluting the tea with a hazardous chemical.