used to do it all the time when i first started mate, And always reported them, Got mixed reactions, but did pick up an old 1 once, cant remember exact details mate, but had won at least twice, and had been living in the town for 2 years, the guy had him came and collected him!!! Dont do it anymore, got some strange looks, even a woman told me to stop stealing pigeons!!! lol. onced i had explained she was o.k. But dont fetch them into your own loft mate, As you dont know what they might be carrying, or how long they been there, But if your adamant keep it seperated, and get it tested, and treated accordingly, You never know what might become