EXCLUSIVE

NBC, ABC, CBS, CNN and most blogs are trying to convince you there is virtually NO EVIDENCE of voter fraud, so Trump's fears are bogus ... but we drilled down and some officials who run the voting systems around the country are VERY worried about fraudulent voting.

Fact is ... some states do not require voters to present any ID before casting a ballot. They shockingly rely on the ability of precinct poll workers to match a person's signature with the signature on the voter registration form. So a 70-year-old lady trying to manage a precinct is supposed to do what trained handwriting experts do in court ... ferret out the frauds.

Here are a few examples of what some say are deep concerns about possible voting fraud:

-- Nick LaLota, Suffolk County NY Board of Elections Commissioner, tells TMZ he's expecting 500,000 people to show up at voting booths on Nov. 8th, and he concedes signature verification compromises the integrity of the voting process. He says it will be hard to know who votes when they shouldn't.

-- Marcy Crawford, Deputy Commissioner of the Board of Elections for Allegany County, tells us voter fraud in her county is a real concern. She says everyone's talking about it in her office.

-- John Arntz, Director of Elections in San Francisco, says the way their system works ... voters show up at the polling place, announce their name to the polling place worker, who then checks the voting rolls and reads a corresponding address. If the voter says, "That's my address," he or she gets a ballot. Arntz concedes that it leaves the system open to fraud.

Counties and states are increasingly using signature verification in place of IDs.