Former Nova Scotia lieutenant-governor Mayann Francis says the arrest of a black woman in a Walmart last week in Halifax has left her shaken and even fearful of police for the first time.

Last week, officers arrested Santina Rao while she was shopping with her baby and toddler. She suffered a broken wrist and numerous bruises and is now facing charges of causing a disturbance, assaulting a peace officer and resisting arrest.

"I just went into this deep sense of 'Oh my heavens, we are gone back 100 years," Francis told CBC Nova Scotia's Information Morning.

Francis served as lieutenant-governor from 2006 to 2012 — the only black Nova Scotian to hold the position — and has spoken out before about racial profiling she said she faces in retail stores in the province.

She said a video clip showing police on top of Rao "scared" her and brought to mind Viola Desmond, the black woman who was dragged from a New Glasgow, N.S., movie theatre in 1946 for sitting in the whites-only section.

Wanda Robson, left, Nova Scotia Premier Darrell Dexter and Percy Paris, minister of African Nova Scotian affairs, watch as Lt.-Gov. Mayann Francis signs the official pardon for Robson's sister, Viola Desmond, on April 15, 2010. (Canadian Press)

Rao has said she paid for electronics in one section of the store and stopped in a toy aisle on her way to ring in some produce that couldn't be weighed at the checkout where she made her first purchase.

She said police believed she was concealing items and that when she became upset they cuffed her without explaining why she was being arrested. She was not charged with theft.

Chief Dan Kinsella on Monday called the situation "disappointing" and said he has referred the case to Nova Scotia's police watchdog. On Tuesday afternoon, the Serious Incident Response Team announced it will be investigating the incident.

The Halifax Examiner has posted a video of part of the arrest.

The incident has left Francis thinking about what would have happened if she had been accused of shoplifting.

"What if they called and the police came and surrounded me? Would my fear cause me to do something that I would not normally do? Would I show ID if they asked me to? I don't know," she said.

Francis served as lieutenant-governor from 2006 to 2012, and is the only black Nova Scotian to hold the position.

Francis said the incident's timing is particularly bad because it makes people question Halifax Regional Police's recent apology for street checks, a now outlawed practice that disproportionately targeted black men.

Precautions while shopping

Being followed through stores is something with which Francis said she's all too familiar. As a black woman, she said she doesn't have the option of putting things in reusable bags because she has no doubt a staff member would pull her aside.

She employs her own strategy of keeping her hands out of her pockets and avoiding opening her bags.

"I just do all of that so that I don't add to the suspicion of being a black woman, which is very stressful," she said. "I'm treated like 'Why are you in this store? You're not welcome.'"

A young black woman says she was racially profiled while shopping last week. Our former Lieutenant Governor says it's more common than you might think. 8:39

Recently, Francis said she couldn't avoid taking something out of her bag but she did so reluctantly.

"I just said a little quick prayer and I pulled the backpack off," she said. "So this is what I go through because I don't want to go through what happened at Walmart.

"Look at our own backyard. Canada, Nova Scotia. Racism is alive and well."

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