NRL boss Todd Greenberg has warned players about the company they keep after the game has learnt a "number of lessons" following police's 24-month probe into alleged match fixing in the game.
Despite being cleared of match fixing police said they had "no doubt" players had provided inside information to punters.
Police also expressed concerns about players using illicit drugs and being lured into the criminal underworld by the offers of free sex.
Greenberg said the NRL had not been provided the names of players involved by the police.
"A lot of these challengers flow across our community," Greenberg said in Melbourne.
"I'm pleased after a long period of time there are no charges.
"We've made some significant changes around the rules and regulations ... Players and officials inside of rugby league need to be very conscious of the company they keep and the people they hang around with.
"This investigation will hold us in good stead.
"When things play out very publicly we want those allegations and the substance of that information tested."
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