Files will be handed to the Scottish Criminal Cases Review Commission.
Travel Delays And A Crush at T
Organisers at T in the Park say safety is their top priority, after several problems at the new site last night.
Thousands of people trying to leave Strathallan Castle were caught up in delays of 4 hours or more, after heavy rain turned the car park into a mudbath last night.
Many vehicles had to be pulled free by tractors.
Lyndsey from Wishaw told Heart:
"The only reason why I am home after 5 hours is because a group of five or six guys decided to get out their cars and push other cars up the hill.
"I don't think I'd be up for going back to T in the Park. It was very disorganised. The Strathallan site is very small."
There were also massive delays to bus services, for a second night.
Bosses are also now looking at crowd control, after hundreds of fans got caught in a crush near the King Tuts tent.
People we've been speaking to say they feared for their lives.
Organisers sent us this statement after the incident:
"As soon as we became aware of the situation, we sent a response team of security guards and a medical team to manage the area. We apologise for any distress the fans involved may have experienced, however we can confirm that no one was hurt."
"Safety at the event is our highest priority and we have closed down the surrounding food units for a short period of time to create more room while we monitor the area closely."
Police Scotland last night reported 28 arrests at the event so far.
They also reported the death of a man, 36, who was found in a campsite on the Strathallan site.
His death is currently being treated as unexplained.
Colin Rodger, event manager for T in the Park, said of the death:
''We are extremely saddened by this news, and our thoughts are with the family at this time.
''We're doing everything possible to help emergency services with their inquiries.''
Noel Gallagher's High Flying Birds is set to bring T in the Park to a close today after sets from artists including Paloma Faith, Ella Eyre and the Stereophonics.
Thousands of revellers descended on the Strathallan Castle estate in Perthshire on Friday for the three-day event featuring some of music's top acts.
Fans have already enjoyed performances from last night's headline act Avicii, and other big names including Jessie J, The Script and Twin Atlantic.
Festival director Geoff Ellis said: ''We're delighted with how everything is going so far. There's an incredible atmosphere onsite.''
The line-up today also features The Prodigy, Idlewild and Clean Bandit.
Organisers DF Concerts struck a deal to shift the 2015 festival following health and safety concerns about an underground oil pipeline at nearby Balado, where it had been held for 18 years.
Concerns were raised about traffic arrangements for the event, and the potential for anti-social behaviour.
It's predicted the Tories could win a number of seats in Scotland.
Police Scotland say the "targeted attack'' happened at the man's home in Uddingston.
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