Use caution. Unless you are certain that the accusation is only a minor one and will not result in criminal charges, it is best to consult with an attorney. This is especially true if a law enforcement official is asking you to give a statement or cooperate in an investigation. You should consult with an attorney before making any statements. What you say, no matter how well-intentioned, can be misconstrued and may be used against you in a subsequent prosecution. Even if you are promised leniency in exchange for your cooperation, you can never retract what you have already said. Therefore, it is best to consult with an attorney prior to making any statements in order to ensure that your rights are protected.
In addition law enforcement officials are allowed to LIE TO YOU. A police investigator can lie to you to attempt to gain your cooperation or confession. It is incumbent on you to consult with a professional criminal defense attorney before speaking with any government official!