Simple model to avoid bribes

Announce a huge reward to x who gives the information of person y who offers bribe and punish person y severely. Should work psychologically against offences and offering bribes.

An example

1) A motorist shoots the speed limit. Fine is Rs 300.
2) He offers Rs 100 to the Cop.
3) If the Cop accepts it and later register's the offender's name for offering bribe, he would give a reward of Rs 900.
4) The offender would then need to pay Rs 1000 to the government.

After many instances, the results could be one/more than one of these.

1) The number of offences would reduce
2) The offender would refuse to pay bribe even if the cop is fine with it as he is skeptic of the cop.

Problems

1) Huge cry from the public initially.