I’m a female forensic expert and most murderers are idiots – they always make the same mistake that gets them caught

MANY serial killers think they can get away with murder, but according to a female forensic expert, they all make the same simple mistake.

Jo Millington, who is one of the UK’s top specialists in blood spatter analysis, has told how killers may think they've gone to the extreme to cover their tracks, but seem to forget how science can identify them.

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The forensic expert recalled one particular killer who made the vital mistake of signing his name after committing a gruesome murder.

“I once dealt with a case where the perpetrator had taken the blood of his victim and he'd written a really horrible word on the wall and then done an exclamation point," she said, speaking to the LadBible podcast.

“And in that point was his fingerprint in the blood of the victim. And you think to yourself, what an idiot!’”

Jo goes on explain how she uses blood from pigs' bodies to gauge how human body fluids would splash during a real-life crime.

She points out that a murderer can try and clean up as well as they want after committing a crime, but says there'll always be a spec of blood left behind that'll prove crucial for the forensic team of investigators.

In that point was his fingerprint in the blood of the victim. And you think to yourself, what an idiot!

"Between the tiles of the bathroom, there's grout that soaks up blood like a sponge," she says.

The forensic expert adds that blood also finds its way into the small cracks of the bathroom and floor tiles, which will only show up during forensic analysis.

However, according to Jo, some killers don't bother trying to clean up after themselves at all.

She says that she once visited a crime scene and was met by several pots and pans that'd been left on the cooker hob.

At first, Jo recalls assuming that the tenants were just a little slack on their washing up...but she soon realised she was very mistaken.

Instead, the forensic expert says she quickly realised that one of the pans was filled with a partially-cooked human brain.

And Jo, who helped to capture the terrorists who killed 52 people in the July 7 London bomb attacks, is the first to admit how traumatising dealing with the aftermath of murder can be.

She says how people are asked to "pick bits of body tissue off buildings" and are requesting that they work in circumstances that are "beyond imagination."