PhysicalHealthcareHealthcareLossSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Government IDHealth (basic)MediumContained

River Arch Dental/Hamner Square Dental

bd_f72bca9a8adee059 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 18, 2012

Filed

Jul 17, 2012

To disclose

9 weeks

Affected

Not disclosed

Linked

3 filings

Confidence

65%

Full breach record for River Arch Dental/Hamner Square Dental →

River Arch Dental and Hamner Square Dental reported that a Patterson Dental representative lost an unencrypted USB drive containing patient data (names, SSNs, DOBs, dental records) in the mail. The drive was placed in an envelope on May 10, 2012, and discovered missing when the envelope arrived torn on May 14, 2012. The practices were notified on May 18, 2012, and sent notices on July 16, 2012.

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California clockDiscovered May 18, 2012 → Notified Jul 16, 201259d ✓ CA 60-day OK9 weeks discovery → filing

Incident timeline

undetected · 8 days

discovery → filing · 9 weeks / 60 days

May 10, 2012

Begins

May 18, 2012

Discovered

Jul 17, 2012

Filed

vs. sector median

2 wks faster

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

California State AGbd_1b8fcf5da80112182012-07-17Verified
HHS OCRbd_1d9a19d63113c30e2012-07-16 · +1dVerified

Name: River Arch Dental/Hamner Square Dental
norm: river arch dental hamner square dental

Name: River Arch Dental/Hamner Square Dental
norm: river arch dental hamner square dental
Industry: Healthcarellm

Discovered: May 18, 2012
Breach occurred: May 10, 2012 – May 14, 2012
Undetected for: 8 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 16, 2012
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDHealth (basic)
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1052 Exfiltration Over Physical Medium
Third party: via Patterson Dental

During the incident: Investigating the incident with Patterson Dental
Taking steps to enhance security procedures to protect information
Changes made: Taking steps to enhance security procedures to protect information to prevent such an incident from happening again
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: CA 60-day OK · 59d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: May 18, 2012
→ Notified: Jul 16, 2012
59d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: May 18, 2012 → Notified: Jul 16, 2012	59d	60 days (analyst band, pre-2026 discoveries)	CA 60-day OK

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings

View merged incident ↗

HHS OCRJul 16 · first

California State AG+1d

California State AG+1d · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.ca.gov/ecrime/databreach/reports/sb24-32281
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 17, 2012
Raw hash: d00018985ecc6b1058dd987213fd49272c6dc8fecfc461b3ecd6a9fe66d6fb1a

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityRiver Arch Dental/Hamner Square Dental

Victim entityRiver Arch Dental/Hamner Square Dental

Incidentdiscovered May 18, 2012

Stated responseInvestigating the incident with Patterson Dental

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov