Speedbump,
They may not be actually fighting them there, but if they are raising them for that reason I imagine they might be able to find some corrborating evidence, I.e birds with wounds, some of the the little metal spurs they put on thier feet, ecetera.
Gambling = Ledger books
Firearms and other weapons are common at cockfights, mainly because of the large amounts of cash present. Some of these weapons may be illegal.
Law enforcement officials have documented a strong connection between cockfighting and the distribution of illegal drugs. Drug enforcement agents often learn about animal fighting operations as a result of narcotics investigations.
You shake the right tree and you just might cause these people some severe problems.
Might even get new neighbors.