Investigator Dave and the Henious Mystery

‘Dave, come into my office’.
Uh oh, it’s never usually a good sign when someone gets called into the superintendent's office.
Dave sits down on a lovely leather chair opposite Brian, the super. Dave knows it can't be too serious and he hasn't got much to worry about, he can't have made a mistake, he’s the best detective in the world.
‘Now I know you are the best detective in the world’.
The super admits, leading Dave to think there is a serious case brewing.
‘We have had continuing reports about a group of people performing some very disturbing actions and we need you to investigate’.
This was nothing for Dave, he dealt with that before breakfast and had plans to deal with more of it after his afternoon tea.
‘There are a group of people who have constructed a child sex trafficking ring, right here in Cardiff’.
Dave was surprised, he was used to flying all the way around the world solving these sorts of heinous crimes but this doesn't usually happen in Cardiff.
‘We need to learn who these people are, how they communicate and operate, we have the daily actions of one on CCTV but it's all we have to go on’.
Dave knew he couldn't waste any time, he had to see that footage immediately.

The footage appeared to show a rather rugged looking man going about his daily business, Dave knew he was the person they were looking for, he just had that look about him. It started off pretty ordinary, he first went to the bank and got out a little bit of money, he went to the shops and bought milk, he then went to the train station and caught a connection to a station up the road, got a haircut, then got a train back.
‘Hmm’
It seemed like an ordinary day. But there had to be a clue somewhere.
Dave went back over the footage, did anything stand out? Did anyone seem odd? Was there any secret contact?
People did seem odd, but it's a big city and that is a given. There was no secret contact that Dave could see with his expertly trained eyes. Something stood out, though.
‘Could it be?’
Every time this man boarded the train he would always walk on before the passengers had gotten off the train first.
‘Surely it’s just a coincidence!’
But what if it wasn’t? Dave then thought.

Dave then began looking at the other tapes, if anyone else was doing the same thing. Surely enough there was one other, another rugged looking man barging onto a train the second the doors opened not waiting until the current passengers had gotten off.
Dave used the big secret computer to find out who that man was and ran a check on his browsing history, and for sure he came back as a grade A nonce.
‘Surely it can’t be! It could just be those two people that happen to do it, it can’t be that all people who do that are child sex traffickers, can it?’
‘Superintendant, we need to raid an address, asap.’
‘Dave, get your detective hat, we’re going to that address right now.’
Sure enough, they travelled to the address of that second rugged man, with their sirens off as to not arouse suspicion and the scare the man away. Dave, the Super, and their team of top-end police enforcers got out of the car and ran to the address the man lived at. It was a relatively ordinary looking house in a rather unsuspecting neighbourhood.  Before any of them could blink they smashed the door in and ran inside!
‘Police, stay where you are and put your hands on your head!’
Surely enough, when they got to the one of the messier bedrooms upstairs there was a man with his hands on his head, the same man as in the picture.
‘You’re nicked, son.’
Said all of the police enforcers multiple times as he was handcuffed.
‘Rugged man, you are under arrest for child sex trafficking, you do not have to say anything but it may harm your defence if you fail to mention something you later rely on in court’
Dave said this with confidence, but he missed that day in training so he wasn’t entirely sure if that was right.  Although it didn’t matter, they always knew what he meant.
‘Right, let’s have a looking around’
They looked in two of the upstairs bedrooms and found nothing. The kitchen, nothing. They were starting to worry.
‘The garage!’
Thought dave, audibly, with his mouth.
‘That’s where evidence could be!’
So they stormed into the garage, and sure enough, evidence.
There were piles upon piles of children between the ages of 6 to 14, alive and unharmed, just laying there, watching television. They were literally just laying there on top of each other like a giant pile of children unaware of both personal space and space utilisation. They realised the police are there to save them, finished watching their show and walked out without saying anything, probably home to continue watching television.
‘Good work, Dave’
The super was impressed.
‘But this isn’t over yet, we need to stop them all!’

Dave sat back down in front of the television footage from the day after, time to test his hypothesis. Within a few hours there was another man pushing his way onto a train before the passengers got off. Dave zoomed into the man, so much so he could see the t-shirt he was wearing, what did it read?
‘I’m a proper nonce’
More evidence.
And the next person to push in as well, what did their t-shirt say?
‘I’m a diddler’
And so on and so on.
Dave ran tests upon tests for a couple of weeks and found that every single person that got onto a train before the passengers had gotten off were proper dirty paedo’s.
‘How can we stop this?’
Asked the super
‘I don’t know.’
Said Dave
‘But what I do know is that everyone should know that every single person without fail that gets onto a train without letting the current passengers get off is a right filthy nonce and should be treated like one’
‘Case closed’