Can you enter into Costa Rica with a impaired charge
If you are referring to Driving While Impaired, yes, I believe you can. Costa Rica tends to only refuse entry to people convicted of crimes against children or other large scale accusations. If you are still "on probation" from your charge make sure you have permission from whoever "controls" you to leave Canada otherwise you may have some problems coming back home.
Thanks for the reply
If your "Impaired" conviction was not a felony, I doubt that you would have a problem. The Migracion computers are supposedly able to check Interpol to see if there's some kind of serious problem. But just a charge of Driving While Impaired probably wouldn't show up anywhere. And yes, they are mostly looking for serious charges such as human trafficking, drug smuggling (or other smuggling), money laundering and pedophiles as well as violent assaults and murder.
This article suggests that your DUI is now known to Costa Rica when your passport is scanned on arrival as they are locked in step with the FBI. If they decide to use it, I would guess they would not attempt to differentiate between DWI and double homicide, they will just escort you back to the carrier that brought you and send you home.
"In the future, it is possible that Costa Rica may exclude U.S. citizens with criminal records at the airport. This is because Costa Rica is now online with a federal database that provides criminal background information to foreign governments. Anyone who has been turned around after attempting to enter Canada with a DUI conviction on their record can attest to the effectiveness of the system."
The OP is from Canada, mickymoose, not the US.