Maine does not have a red flag law. Instead, it's a yellow flag or yellow paper law. It’s a process with more steps than the more assertive red flag laws in some states.

That means they do have “extreme risk protection orders” that can be used for law enforcement officers to remove firearms from the possession of people at risk of using guns to harm themselves or others. But in Maine, it goes into effect “when a law enforcement officer has taken a person into protective custody." That means the person in question must have had a run-in with the law. 
Then, a medical practitioner must “assess whether the person presents a likelihood of foreseeable harm.” And that’s a hindrance