SAN ANTONIO -- A man and a woman were taken into police custody Friday after a concerned citizen spotted the boy at a blood center on Brooklyn and Broadway.

But police said that the couple may not be charged with any crime.

Police said the woman who had the boy had baby-sat the child before, and she claimed she was baby-sitting him again.

Police say they don't have enough proof that she intended to keep him from his mother.

Constance Moore was anxious to hold her 2-year-old son, Aaron, after he was located, and when the toddler walked in, the reaction on her face said it all.

Carmen Rangel was the one who spotted young Aaron.

"He didn't look like he was very comfortable at all. You know how you're a little kid and you want to be with your mom and if you're surrounded by people you just want to cling to her? He didn't look comfortable at all," said Rangel.

Her instinct was right.

Rangel was donating plasma when she saw Aaron and remembered an Amber Alert out for a blond boy with green eyes.

And then she recognized the man with whom the boy was at the center.

"He was saying that it was his son, and the lady next to me noticed too, and she tried telling the people up there but they said they didn't known anything," said Rangel.

Rangel immediately called 911.

"The child is fine; he's happy and not crying,” said Sgt. Gabe Trevino, SAPD. “We gave him some water; he seemed thirsty."

It turns out the woman who had Aaron was Andrea Graham, Moore's roommate. They lived together for only a week.

Moore trusted Graham to baby-sit Aaron on Wednesday while she went out to run errands. When she came back, she said he was gone.

"Even when I was around, she was always treating him nice,” Moore said, the child’s mother. “The way she was around him didn't give me no reason not to trust her. She had no permission to take him to a hotel or only to be at the house with him."

There's no word as to why they allegedly took the child, but Graham's boyfriend told police she recently suffered a miscarriage.

Moore is now being questioned by Child Protective Services, and she fears she will not get her child back.

Child Protective Services has not allowed her to take the boy home.