La policía revisa la evidencia.

In Spanish, la policía is usually treated as a singular feminine noun when it means the police force.

So:

• La policía revisa... = The police review/check...
• Not La policía revisan...

This is different from English, where the police are is standard.

Also, policía can sometimes refer to:

• a police officer: un policía / una policía
• the police force: la policía

In this sentence, it means the police force, so the verb is singular: revisa.

Because the subject is la policía, which is grammatically singular here.

The verb revisar in the present tense goes like this:

• yo reviso
• tú revisas
• él / ella / usted revisa
• nosotros revisamos
• vosotros revisáis
• ellos / ellas / ustedes revisan

Since la policía is treated like she/it grammatically, Spanish uses revisa.

Revisa comes from revisar, which usually means:

• to check
• to inspect
• to examine
• to review

In this sentence, the most natural English idea is something like:

• The police examine the evidence
• The police check the evidence
• The police review the evidence

The best translation depends on context. In a police/investigation context, examine or review is often a good fit.

It is the present simple (also called the present indicative).

So La policía revisa la evidencia can mean things like:

• The police review the evidence
• The police are reviewing the evidence (in some contexts)
• The police review evidence (as a general action, depending on context)

Spanish present tense is often broader than English present simple. It can describe:

• habitual actions
• general truths
• actions happening now

If you want to make the right now idea more explicit, Spanish can also use:

• La policía está revisando la evidencia. = The police are reviewing the evidence.

Spanish often uses the definite article el / la / los / las more than English does.

Here, la evidencia means the evidence. It suggests a specific set of evidence relevant in the situation.

So:

• La policía revisa la evidencia. = The police review the evidence.

Without the article, evidencia would sound less natural in this sentence.

Evidencia is understandable, but in Spain, especially in police or legal contexts, las pruebas is often more natural.

So a Spaniard might very naturally say:

• La policía revisa las pruebas.

Why? Because pruebas often means:

• evidence
• proof
• forensic material

Meanwhile, evidencia can sometimes sound more like:

• obviousness
• clear indication
• evidence in a more abstract sense

So your sentence is understandable, but las pruebas may sound more idiomatic in many Spain contexts.

Because the personal a is mainly used before specific people (and sometimes pets or personified beings), not before things.

Compare:

• Veo a María. = I see María.
• Veo el coche. = I see the car.

In your sentence, la evidencia is a thing, not a person, so there is no personal a:

• La policía revisa la evidencia.

Yes, but the basic neutral word order here is:

• Subject + Verb + Object
• La policía
  • revisa
    • la evidencia

That is the most straightforward order.

Spanish can change word order for emphasis, but it may sound more marked:

• La evidencia la revisa la policía.
  This puts extra emphasis on the evidence.

For a learner, the original sentence is the safest and most neutral version.

The accent mark shows the stress: po-li-CÍ-a.

Without the written accent, Spanish pronunciation rules would suggest a different stress pattern. The accent tells you clearly that the stress falls on cí.

So:

• policía → stress on cí
• pronounced roughly: po-lee-THEE-ah in most of Spain
  or po-lee-SEE-ah in Latin American pronunciation

The accent mark is important both for pronunciation and correct spelling.

A Spain Spanish pronunciation would be approximately:

• La po-li-CÍ-a re-VI-sa la e-vi-DEN-thia

A few useful notes:

• ci in policía is usually pronounced like thia in most of Spain
• z and soft c (before e/i) are also usually pronounced with the th sound in most of Spain
• so evidencia sounds roughly like e-vi-DEN-thia

If you are aiming for Spain Spanish, that th sound is normal.

Usually in this sentence, la policía is understood as the police force, not one officer.

If you wanted to say the police officer (female), you would usually mean:

• la policía = the policewoman / female police officer

So technically the phrase can refer to:

1. the police force
2. a female police officer

But context usually makes it clear. In a sentence like La policía revisa la evidencia, many people will understand it as the police in general, especially if the context is an investigation.

If you wanted to be very explicit about a single officer, you could say:

• La agente revisa la evidencia.
• La policía revisa la evidencia ella sola. (if context makes that useful)

Yes. That version is also correct, and it emphasizes that the action is happening right now.

Compare:

• La policía revisa la evidencia.
  More neutral. Can mean reviews, is reviewing, or a general present action depending on context.

• La policía está revisando la evidencia.
  More clearly: The police are reviewing the evidence right now.

Both are correct; the difference is mainly how explicitly you want to show the ongoing action.