Tower controller reported an aircraft landing and going off the runway; then entering the runway aga...

Attributes
ACN	1424315
Time
Date	201702
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	None
Flight Plan	VFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Events
Anomaly	Ground Excursion Runway

Narrative:

Aircraft X was given the option for runway 16L upon landing they veered off to the left edge of the runway ground pointed out the aircraft off the runway. I saw the aircraft re-entering the runway just north of golf and maneuvered back to the centerline and gave them instructions to turn left at the end and contact ground point seven. Wind was light and variable at 4 kts.

Original NASA ASRS Text

Title: Tower Controller reported an aircraft landing and going off the runway; then entering the runway again.

Narrative: Aircraft X was given the option for RWY 16L upon landing they veered off to the left edge of the runway ground pointed out the aircraft off the runway. I saw the aircraft re-entering the runway just north of Golf and maneuvered back to the centerline and gave them instructions to turn left at the end and contact ground point seven. Wind was light and variable at 4 kts.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Tower controller reported an aircraft landing and going off the runway; then entering the runway again.