Perth man who supplied fatal dose of heroin to 'celebrate' end of rehab avoids jail

A Perth man who supplied a lethal dose of heroin to a friend as they celebrated the end of his drug rehabilitation course has dodged jail.

The District Court of Western Australia heard on Friday that Peter Roy Barto, 46, didn't "taste" the drug to test its strength before helping three companions to inject it in a Burswood hotel room in July last year.

A woman fell unconscious and had to be taken to Royal Perth Hospital while a man died at the hotel.

Judge Bruce Goetze said Barto's rehab course was obviously not successful given how he celebrated its conclusion.

"Now, there's a certain irony in all of that but that's what you did," Judge Goetze said.

"You sourced this heroin, you supplied it, you assisted others in the injection of it.

"Lives are ruined because people take drugs. And you probably only know that too well."

Barto, who is again undergoing a rehabilitation course, was handed a term of imprisonment of 12 months, conditionally suspended for the same period.