From the link you provided, those same procedures set out:
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Can't deliver a summons to someone whose whereabouts are unknown. They got a Canada-wide warrant because he evaded justice by taking off before they could make an arrest. It appears he anticipated an arrest, but instead of seeking legal representation, he fled. This can infer consciousness of guilt, but can also be interpreted as fear of being unjustly accused.
ETA: As for what evidence LE presented that resulted in a warrant being issued, doesn't necessarily have to be forensic evidence. Could be that McD sold them a bunch of BS that they subsequently discovered were a pack of lies (i.e. during questioning said he never saw Swenty or her vehicle vs his goodbye note saying he saw her vehicle but the battery was dead)
Thank you for pointing that out SB. I think McD left the Interlake early Thursday morning after he called his ex-roommate; then he travelled in a stolen vehicle from FB to Winnipeg and arrived in Saskatoon, SK by 11:30 pm. If a summons had been issued first, he might not have panicked and fled. If Mc has no legal knowledge & experience to guide him and he didn't have the resources to hire a lawyer at that point, his behavior is rational. I'm curious to know why the RCMP didn't charge McD with first degree murder.
The fact NS's jacket was removed and her body was discovered the following day by RCMP has me baffled. If the COD was caused by a firearm, there would be a bullet for evidence but if she was strangled to death, there may be no such evidence.
Police can't arrest someone on mere suspicion, or just to help with an investigation and I can't put my finger on why McD would murder Nancy Swenty. NS supposedly returned home from work on Wednesday and McD said he saw her truck downtown and the battery was dead which sounds suspicious but isn't enough to charge him with murder. Nancy Swenty lived outside of town alone in a house and it’s unclear whether she had any neighbors living close by on the same road who could see what was going on at her house.
Although FB's main industry is agricultre, because it is located on a main highway it is a community that attracts thousands of tourists and sports enthusiasts of all kinds during the summer.
This has been one of Manitoba's best summers weather-wise so the Interlake area would have been swarming with thousands of tourists near the end of July and it would have been very busy in the Co-op Store where NS worked as a cashier/clerk. Alot of people stop there for food and supplies so it is possible NS was stalked and attacked by a non-local. MO