Probable Cause

Probable cause is an exception to the warrant requirement under the 4th Amendment. In other words, police do not need a warrant to arrest a person as long as they have probable cause.

Definition

Probable cause means that the facts known to the officer warrant a reasonable belief that a crime has occurred or that evidence of a crime is located in a specific place. Probable cause is based on the totality of the circumstances and does not need to rely on any one fact. It does not have to be certain and can be based on probabilities and common sense conclusions. (United States v. Martin (2010) 613 F.3d 1295.)

Probable cause requires more than mere suspicion but does not necessitate facts sufficient to establish guilt. (United States v. Munoz-Nava (2008) 524 F.3d 1137.)

What Can Police Do if They Have Probable Cause?

Police arrest a person if they reasonably believe that person committed a crime. Police can search an area if they have reason to believe there is evidence of a crime in that area.

Specific Examples

An officer may arrest a person when multiple witnesses identify the suspect as the shooter in a homicide. (Moorer v. City of Chicago (2024) 94 F.4th 715.)

An officer may arrest a felon for unlawfully possessing a firearm after they observe a firearm in their car. (Young v. City of Chicago (2020) 987 F.3d 641.)

An officer may arrest a person when they observe facts consistent with drug transportation based on their previous experience with drug transportation. (United States v. Munoz-Nava (2008) 524 F.3d 1137.)

Insufficient Probable Cause

An officer cannot arrest a person based on their presence at a suspected stash house and traveling in an indirect route to their location. (United States v. Cervantes (2012) 678 F.3d 798.)

An officer cannot arrest a person for being near a crime without indications that the person is involved in the crime. (Williams v. City of Chicago (2013) 733 F.3d 749.)

An officer cannot arrest a person for possessing marijuana unless there is some indication the marijuana is being possessed or sold unlawfully. (People v. Lee (2019) 40 Cal.App.5th 853.) If you believe officers arrested you without probable cause, you should consult an attorney. You could contest your arrest in court and ask the judge to suppress evidence obtained unlawfully by police. You can also file a complaint or sue the police for their unlawful arrest.

Can Police Pull You Over For Swerving?

The answer is yes. Police can pull you over for swerving, even if you do not swerve into other lanes.

Swerving Into Other Lanes

Police can lawfully pull you over for any violation of the Vehicle Code. Swerving across lanes lines is a violation of California Vehicle Code § 21658.

California Vehicle Code § 21658 requires drivers to:

  • Drive as nearly as practical within one lane;
  • Change lanes only when it is reasonably safe.

A driver violates this law by driving in two lanes at once (lane straddling), or drifting into a lane when it is not safe.

The punishment for violating section 21658 is a fine. The level of offense is infraction. This means violating this law does not result in jail or prison confinement.

Swerving Inside Your Lane

It is not a violation of the Vehicle Code to drift within one lane. (United States v. Colin (2002) 314 F.3d 439.) In fact, it is normal for a vehicle to move side to side within a lane as it travels. But police can still pull you over for drifting inside a lane. How is this possible?

Answer:

Police can pull you over for swerving because it is considered erratic driving under California case law. Erratic driving gives police reasonable suspicion to believe the driver is impaired. Therefore, police can initiate a traffic stop even though the swerving does not violate the vehicle code.

Examples of “Erratic” Driving:

Summary

Swerving over the lane line is a violation of the California Vehicle Code, punishable as an infraction. It gives police reason to initiate a traffic stop. However, even if the swerving occurs within a lane police can initiate a traffic stop to determine whether the driver is impaired (IE: under the influence of drugs or alcohol or experiencing a medical emergency).

Because vehicles seldom drive perfectly straight, police have the power to stop practically any vehicle.

Do you think this law gives police too much power? You should raise your concerns with your state representative or senator.

I Just Got Arrested, Now What?

After you are arrested, continue to assert your 4th Amendment right to refuse search (except when arrested for DUI) and 5th Amendment right to remain silent.

arrested

right to remain silent

It is very important to remain silent because your own statements can be used to convict you. Wait until your attorney is present before you make any statements to police.

Statements that seem innocent such as, “I didn’t mean to do it,” “I drank much earlier today,” or “he pushed me first,” are actually confessions to a crime.


Tips and Tricks to Remaining Silent

arrested

Confessions are an easy way for police to secure an arrest and for prosecutors to obtain a conviction. Although you have the right to remain silent, the police have developed strategies to get you to talk.

“if you didn’t do anything wrong, tell me what happened.”

You may be guilty of a crime even though you didn’t do anything “wrong.” For this reason, it is best to say nothing to police until your attorney is present.

waiting for you to start talking

If you start a conversation with police, you have waived the right to remain silent. Remember: “Any statements you make can be used against you in a court of law.”

“you have the right to remain silent…”

The Rule

If police do not give you this well-known Miranda warning, your confession could be excluded from criminal proceedings.

Miranda Limitation

However, the Miranda rule only excludes confessions that occur during “custodial interrogations.” Those are interrogations that occur in police custody, typically in a holding area or at a jail.

Police Strategy

Police usually follow the Miranda warning with “Do you want to waive these rights and talk to me?” You can invoke your right to remain silent by stating, “No. I don’t want to talk to you.” If you remain silent, police may continue to talk to you. You can re-invoke your right at any time by saying “I don’t want to say anything else, I want to talk to a lawyer.”


right to refuse search

It is also important to refuse search because evidence found during the search can be used to convict you. If you consent to search of your property, you waive your right to contest the search in court.

Exception: Arrested for DUI

If you are arrested for DUI, you must provide a blood, breath, or urine sample to determine you blood alcohol concentration (BAC). Failure to provide a sample can result in additional criminal charges AND further DMV action against your license.


Tips and Tricks to Refuse Search

arrested

Consensual search is any easy way for police to secure an arrest and for prosecutors to obtain a conviction. Although you have the right to refuse search, the police have developed strategies to convince you to consent.

“sign a consent to search form to get your phone back”

If police believe there is evidence of a crime on your phone, they will not return it to you unless you consent to search. We all “need” our smart phones, but you will likely be better off refusing search and picking up a temporary phone.

“if you don’t consent, we will get warrant”

You have the right to insist police obtain a warrant, except when you are arrested for DUI. Requesting a warrant will delay the police, so be polite and let them know you respect them and their job.

“if you have nothing to hide, let us search”

Your personal items are private and you have the constitutional right to refuse search.

“if you work with me, I’ll work with you”

Even if you cooperate with police, they are not legally required to help your case.


Russell Brown
Criminal Defense Attorney

Police Stops and Your Rights

tips on safely interacting with police during stops

Knowing your duties, rights, and law enforcement objectives can help you safely navigate an encounter with law enforcement. Below is a brief discussion of things to consider if the police stop you.

step 1: know your dutiespolice

police

Identify Yourself

You must identify yourself if police have probable cause to believe you committed a crime, have a warrant for your arrest, or are in violation of probation or parole.

Provide Your Driver’s License

You must provide your driver’s license if you are pulled over while driving.

Probation or Parole

You must admit that you are on probation or parole if doing so is a condition of your probation or parole.

step 2: know your rights

police

Remain Silent (5th Amendment)

Except for the duties above, you are not required to respond to questions.

Refuse Search (4th Amendment)

You do not have to allow police to search you, your possessions, or your vehicle, unless submitting to search is a condition of probation or parole.

Ask if You are Free to Leave (4th Amendment)

If you are not free to leave, law enforcement must have a reason for detaining you.

step 3: know the police

police

Authority

Authority figures do not like signs of disrespect, such as being ignored, or rude, impolite, or offensive behavior.

Crime-fighting

The modern policing focuses on crime-fighting. If police believe you are obstructing or delaying them from this objective, the could arrest you or use force against you.

Armed

Consider that most police are armed and some carry fully automatic assault weapons.

Immunity

Officers are immune to most civil lawsuit and rarely face criminal prosecution or internal discipline. Therefore, police have few if any consequences for harming you or violating your rights.

What Can I Say to Police?

  1. I respect law enforcement and the job you do.
  2. However, I am not going to consent to a search of myself, my property, or my vehicle.
  3. I will not resist you, but I will not consent to my detention, search, or seizure.
  4. Nor will I answer any questions without my lawyer present.
  5. With that being said, am I free to leave?

What Can I Do if Police Violated My Rights?

If you can prove police misconduct, the judge could dismiss your criminal case. You could also sue the law enforcement for violating your established constitutional rights.