Forgery for cheating under Section 468 of the Indian Penal Code is a non-bailable and non-compoundable offence. A non-bailable offence means that the accused cannot claim bail as a matter of right, but has to apply for it before the court. A non-compoundable offence means that the parties cannot settle the matter out of court. The punishment for forgery under Section 468 is imprisonment up to seven years and fine.
However, the Supreme Court has issued some guidelines to prevent the misuse of arrest and detention powers by the police and to protect the rights of the accused. The court has directed that arrest should be made only in exceptional cases where there is a reasonable suspicion of the accused being involved in a serious offence or being likely to abscond or tamper with evidence or threaten witnesses. The court has also directed that the police should record the reasons for making or not making an arrest and inform the accused of his rights and the grounds of arrest.
Therefore, it is possible that the police did not arrest the person who forged your signature because they did not find any compelling reason to do so, or because they followed the Supreme Court’s guidelines. However, this does not mean that the person can go scot-free with just a warning. He can still be prosecuted and punished by the court if he is found guilty of forgery.
As for your second question, you can use the FSL report obtained in your criminal case as evidence in your civil case, provided that you follow certain procedures. You will have to file an application before the civil court seeking permission to use the FSL report as evidence. You will also have to give notice to the other party and give them an opportunity to cross-examine the FSL expert or challenge the report. The civil court will then decide whether to admit or reject the FSL report as evidence based on its relevance and reliability.