Is the word policiais the same in Brazilian and European Portuguese?

Yes

The word "policiais" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese. The only difference is in pronunciation. In Brazilian Portuguese, the vowels are typically more open and clearly articulated, and the rhythm is more syllable-timed. In Continental Portuguese, unstressed vowels undergo significant reduction; the "i" in the middle of the word is often shortened or almost silent, and the word takes on a more "clipped" or consonant-heavy sound.

Brazilian Portuguese Examples:

1. Os policiais chegaram muito rápido à cena. (The police officers arrived at the scene very quickly.)
2. Eu vi dois policiais patrulhando o bairro. (I saw two police officers patrolling the neighborhood.)
3. Os policiais estão investigando o caso de ontem. (The police officers are investigating yesterday's case.)
4. Precisamos chamar os policiais agora mesmo. (We need to call the police officers right now.)
5. Os policiais prenderam o suspeito em flagrante. (The police officers arrested the suspect in the act.)

Continental Portuguese Examples:

1. Os policiais chegaram muito rápido à residência. (The police officers arrived at the residence very quickly.)
2. Eu vi dois policiais a patrulhar o bairro. (I saw two police officers patrolling the neighborhood.)
3. Os policiais estão a investigar o caso de ontem. (The police officers are investigating yesterday's case.)
4. Precisamos de chamar os policiais agora mesmo. (We need to call the police officers right now.)
5. Os policiais detetaram o suspeito em flagrante. (The police officers detected the suspect in the act.)