Peculiar powder found to be safe
ARLINGTON, Four Mile Run Dr., 4100 block, Jan. 5. Responding to a request from Arlington County police, an animal-control officer with the Humane Society made a run to a popular recreational trail to investigate a report of a “suspicious white powder” that a passerby feared had been placed there to poison dogs.
The powder was determined to be ground chalk, a harmless leftover from a road race.
Because a dry sprinkling poses no health risk, athletic-field marker chalk — which usually is limestone-based — is commonly used to temporarily mark public thoroughfares for walking and running events. Among cases received by the Animal Welfare League of Arlington.