Perry, 54, was found unresponsive in the hot tub of his Los Angeles home in October, 2023, and an autopsy ruled his death was due to the acute effects of ketamine and drowning.
A criminal investigation was launched in December to determine how he obtained the drug.
Tre Lovell, a veteran entertainment lawyer, told The US Sun: "Charges will be coming any day now.Â
"This investigation has been going on for a long time and the leaks are starting to come out, which are probably intentional.
"(Law enforcement sources) are not going to leak stuff unless they intend on indicting, otherwise they'll get egg on their face.
"There are several ways to impose criminal liability, either through the distribution of a controlled substance, an unlawful act that rose to criminal negligence or recklessness, and even in some cases involuntary manslaughter and mail fraud.
"There cases are tough, when somebody overdoses, that's an act of their own volition, so to impose criminal culpability there's a very high standard.
"They have to get warrants, they have to get subpoenas, they have to get private information from his physician, and this takes a lot of time."
Lovell believes the police are pursuing the case so aggressively in order to "deter future acts".
"There's a big policy now to attack this kind of drug distribution, with fentanyl at the top of the chain, and these other controlled substances that are floating around, like ketamine," he said.
Former CIA and FBI special agent Tracy Walder previously told Page Six multiple people could be charged, saying there has been a huge explosion in drug rings by illegally sending prescription medication by post, which is a federal offence.
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