# Polars PII Masking — Mask Names, Emails, MRNs in One Line

> Mask PII in Polars DataFrames locally with a Rust kernel. No regex, no cloud.

Canonical: https://omna.dev/polars-pii-masking

```python
import polars as pl, omna
df = pl.read_parquet("notes.parquet")
masked = df.omna.mask(columns=["note"])
```

Detects names, emails, phone numbers, SSNs, MRNs, addresses. Runs entirely on-device.