Can I fight speeding ticket if cop cited a different speed than what he wrote on the ticket?
I can understand why that would be confusing when the information you are given by the officer doesn't seem to match the written citation.
Generally, however, this is not a defense that will result in the ticket being dismissed. It is a very common practice for a police officer to record a driver at a higher speed on radar and then write the ticket for a lower speed. This is often done as a courtesy to reduce the fine and potential points against your license.
The court's focus will be on the violation as it is written on the official ticket. In your case, the key issue is whether you were driving 50 mph in a 45 mph zone, not whether you were going 57 mph. To successfully fight the citation, you would need to present evidence showing you were not exceeding the posted speed limit of 45 mph.
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If a cop gives you a speeding ticket for 50 mph in a 45 mph zone, even though he told you it was 57 mph on radar, can you use that to defend yourself in court?

I understand your concern. Were you given a ticket for going 50 mph in a 45 mph zone, even though the officer mentioned 57 mph on the radar?

Yes.

Do you have any evidence or documentation to support the discrepancy between the speed mentioned by the officer and the speed on the radar?

No.

Is there anything else the traffic lawyer should know before I connect you? Rest assured they’ll be able to help with your speeding ticket.

No.

Hello, my name is Patrick. I am an attorney with more than 15 years of experience and it will be my sincere pleasure to assist you with your question.

I can understand why that would be confusing when the information you are given by the officer doesn't seem to match the written citation.
Generally, however, this is not a defense that will result in the ticket being dismissed. It is a very common practice for a police officer to record a driver at a higher speed on radar and then write the ticket for a lower speed. This is often done as a courtesy to reduce the fine and potential points against your license.
The court's focus will be on the violation as it is written on the official ticket. In your case, the key issue is whether you were driving 50 mph in a 45 mph zone, not whether you were going 57 mph. To successfully fight the citation, you would need to present evidence showing you were not exceeding the posted speed limit of 45 mph.

I hope this helps. If I can clarify anything, please let me know. It's my pleasure to assist further if necessary.

Thank you.