When I was last a prosecutor in 2011, it was not against any law not to sign a traffic ticket.
Any response is general information only and is not intended, and does not constitute, legal advice.
No, it is not against the law to refuse to sign the citation. The officer will write that you refused on the signature line of the ticket. However, refusing to sign does not invalidate the ticket. Be sure to follow the instructions on the back of the ticket if you want to contest its issuance as deadlines pass quickly.