You always have the right to be represented by a lawyer when the police question you. If a drug agent wants to talk to you, your response should be “I will not speak to you without having a lawyer present.”
You need to assert your right to a lawyer in clear language. Do not say “Maybe I need a lawyer” or “It might be best to wait until I can talk to a lawyer.” The police can keep asking you questions if your request for a lawyer is ambiguous. As soon as you say “I will not speak to you without having a lawyer present,” the police are required to stop asking you questions.
If you are suspected of a drug crime or if you may become a suspect, your lawyer will probably advise you not to talk to the police under any circumstances. If you are a witness to a drug crime, your lawyer may or may not be willing to let you speak to the police. Your lawyer might not want to make that decision without talking to the police (or a prosecutor) first.
Unless there is some benefit you will gain by talking to the police, or unless it is absolutely clear that you are an innocent witness who cannot be harmed by cooperating, your lawyer will probably tell you to decline requests to make a statement.
If you do make a statement to the police, you will want to have a lawyer at your side. Police detectives rely on intimidation and deception as interrogation tactics. They are less likely to do so if your lawyer is present. A lawyer will protect your rights and will end the interview if the police begin to violate them.