to have your hand in the till = 盗用（挪用）公款
Thanks to Erick for the translation of the key phrase!
Example conversation:
A: Gosh! Did you know (that) Fred in Minneapolis was caught with his hand in the till?
B: Really? How much money did he get?
A: I think he stole over US$1,000,000 over 20 years.
B: Wow! He sure knows how to keep his hand in the till!
Audio:
博文
