---
type: "Bill"
title: "Criminal Law - Threat of Mass Violence"
description: "Criminal Law - Threat of Mass Violence"
jurisdiction: "us/states/md"
legislature: "Maryland General Assembly"
session: "2019"
identifier: "HB 420"
citation: "Maryland HB 420 (2019)"
classification: ["bill"]
subjects: ["Criminal Law - Substantive Crimes", "Crimes and Punishments", "Damages", "Emergency Bills", "Penalties and Sentences", "Threats", "Violence"]
status: "enacted"
primary_sponsors: ["Sydnor"]
version_count: 1
action_count: 13
vote_count: 2
first_action: "2019-01-31"
last_action: "2019-04-18"
source: "openstates"
source_identifier: "ocd-bill/9d0f7aec-a8ae-4c30-9335-bbee2c1b18d0"
source_url: "http://mgaleg.maryland.gov/webmga/frmMain.aspx?id=HB420&stab=01&pid=billpage&tab=subject3&ys=2019rs"
source_hash: "8f647b8ea0cb6888689305f084818aa1716d7e81af5a07fa489a4f107c1fa2ab"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-md"]
---

# Maryland HB 420 (2019) — Criminal Law - Threat of Mass Violence

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Bill Text** (committee substitute) — [source](http://mgaleg.maryland.gov/2019RS/bills/hb/hb0420f.pdf)

## Votes

- On Third Reading — **136–0** (pass) · lower
- No motion given — **45–0** (pass) · upper

## Sponsors

- Sydnor — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2019-01-31** First Reading Judiciary `referral-committee`
- **2019-01-31** Hearing 2/19 at 1:00 p.m.
- **2019-03-06** Favorable Report by Judiciary `committee-passage-favorable`
- **2019-03-07** Favorable Report Adopted `committee-passage-favorable`
- **2019-03-07** Second Reading Passed
- **2019-03-08** Third Reading Passed (136-0) `passage`
- **2019-03-11** First Reading Judicial Proceedings `referral-committee`
- **2019-04-01** Favorable Report by Judicial Proceedings `committee-passage-favorable`
- **2019-04-01** Favorable Report Adopted `committee-passage-favorable`
- **2019-04-01** Second Reading Passed
- **2019-04-02** Third Reading Passed (45-0) `passage`
- **2019-04-03** Returned Passed
- **2019-04-18** Approved by the Governor - Chapter 30 `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/9d0f7aec-a8ae-4c30-9335-bbee2c1b18d0`. Confidence: reported (aggregated from official Maryland legislature records).