Did Nancy Guthrie's abductor return to the crime scene?

TUCSON, Ariz. — As a growing memorial outside Nancy Guthrie's Tucson-area home continues to draw visitors, new questions are emerging about whether investigators are monitoring the site. 

Guthrie, the 84-year-old mother of "Today" co-host Savannah Guthrie, is believed to have been abducted from her home in the early hours of Feb. 1.

"They could [have eyes on the memorial], we're just not seeing it," Betsy Brantner Smith, spokesperson for the National Police Association and a retired police sergeant, tells Fox News Digital.