The simplest way would be to ask him flat out. If you are lovers, he should trust you enough to tell you the truth. If you can't even ask him directly about such a thing, you don't have a very healthy relationship.
Smugglers bring things into the country illegally.
If officials find out you are in the US illegally, you will face penalties and may be deported.
They are people who have entered the country illegally.
smuggle
someone who has come into a country illegally from another country
No, I do not have a vampire lover, therefore I cannot find him.
Counterfeiting
There are many ways in which you can find out if your lover is true to you. You can spy on them for example.
Smuggled and contraband are two words that are related to bringing something into a country illegally.
You can be deported from ANY country if you entered the country illegally.
Find another lover. Drink. Drugs.
Deportation.